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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.

A385605 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(4*n+1,k).

Table of values

n a(n)
0 1
1 7
2 58
3 502
4 4436
5 39687
6 358024
7 3249288
8 29624796
9 271080124
10 2487835678
11 22888216006
12 211010997716
13 1948830506578
14 18026768864736
15 166976297995452
16 1548523206590364
17 14376415735219572
18 133599985919343400
19 1242638966005222648
20 11567295503871866536

List of values

[1, 7, 58, 502, 4436, 39687, 358024, 3249288, 29624796, 271080124, 2487835678, 22888216006, 211010997716, 1948830506578, 18026768864736, 166976297995452, 1548523206590364, 14376415735219572, 133599985919343400, 1242638966005222648, 11567295503871866536]

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

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