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code_segments/segment_158.txt

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+K1o0n gave you an array $a$ of length $n$, consisting of numbers $1, 2, \ldots, n$. Accept it? Of course! But what to do with it? Of course, calculate $\text{MEOW}(a)$.
+
+Let $\text{MEX}(S, k)$ be the $k$-th positive (strictly greater than zero) integer in ascending order that is not present in the set $S$. Denote $\text{MEOW}(a)$ as the sum of $\text{MEX}(b, |b| + 1)$, over all distinct subsets $b$ of the array $a$.
+
+Examples of $\text{MEX}(S, k)$ values for sets:
+
+  * $\text{MEX}(\\{3,2\\}, 1) = 1$, because $1$ is the first positive integer not present in the set;    * $\text{MEX}(\\{4,2,1\\}, 2) = 5$, because the first two positive integers not present in the set are $3$ and $5$;    * $\text{MEX}(\\{\\}, 4) = 4$, because there are no numbers in the empty set, so the first $4$ positive integers not present in it are $1, 2, 3, 4$.
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+The first line contains a single integer $t$ ($1 \le t \le 10^4$) — the number of test cases.
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+In a single line of each test case, an integer $n$ ($1 \le n \le 5000$) is entered, the size of the array of gifted numbers.
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+It is guaranteed that the sum of $n^2$ over all test cases does not exceed $25 \cdot 10^6$.
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+For each test case, output a single number — $\text{MEOW}(a)$. Since it may be very large, output it modulo $10^9 + 7$.
+