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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.

A387337 a(n) = Sum_{k=0..n} 2^k * binomial(n+2,k) * binomial(n+2,k+2).

Table of values

n a(n)
0 1
1 9
2 62
3 390
4 2355
5 13923
6 81340
7 471852
8 2725365
9 15698925
10 90278298
11 518620050
12 2977523367
13 17089401735
14 98073111800
15 562837648728
16 3230477449641
17 18545060127249
18 106484493098230
19 611580138259230
20 3513476242850651
21 20190255588746859
22 116056618927038132

List of values

[1, 9, 62, 390, 2355, 13923, 81340, 471852, 2725365, 15698925, 90278298, 518620050, 2977523367, 17089401735, 98073111800, 562837648728, 3230477449641, 18545060127249, 106484493098230, 611580138259230, 3513476242850651, 20190255588746859, 116056618927038132]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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