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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A262410 a(n) = (n+1)*Sum_{k=1..n} binomial(n-1,k-1)*binomial(n+2*k+2,k+1)/(n+k+2).

Table of values

n a(n)
1 5
2 37
3 275
4 2071
5 15781
6 121395
7 940915
8 7337560
9 57507892
10 452598884
11 3574599205
12 28316957579
13 224901946395
14 1790287826789
15 14279629073403
16 114097695427295
17 913103420246956
18 7317725618907700
19 58719917176448820
20 471733089071984376

List of values

[5, 37, 275, 2071, 15781, 121395, 940915, 7337560, 57507892, 452598884, 3574599205, 28316957579, 224901946395, 1790287826789, 14279629073403, 114097695427295, 913103420246956, 7317725618907700, 58719917176448820, 471733089071984376]