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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.

A385004 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(3*n,k).

Table of values

n a(n)
0 1
1 5
2 31
3 200
4 1311
5 8665
6 57556
7 383556
8 2561871
9 17140007
10 114819351
11 769925568
12 5166845124
13 34696155564
14 233113911208
15 1566926561740
16 10536427052463
17 70872688450083
18 476854924775869
19 3209222876463192
20 21602639249766951
21 145444151677134153
22 979397744169608784

List of values

[1, 5, 31, 200, 1311, 8665, 57556, 383556, 2561871, 17140007, 114819351, 769925568, 5166845124, 34696155564, 233113911208, 1566926561740, 10536427052463, 70872688450083, 476854924775869, 3209222876463192, 21602639249766951, 145444151677134153, 979397744169608784]

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

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