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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.

A386371 a(n) = Sum_{k=0..n} (-3)^(n-k) * binomial(5*n+1,k).

Table of values

n a(n)
0 1
1 3
2 31
3 317
4 3399
5 37418
6 419229
7 4756104
8 54463335
9 628197809
10 7287712566
11 84942987198
12 993941174829
13 11668806723876
14 137378189197112
15 1621322803014672
16 19175540677541991
17 227217662222902443
18 2696878158795639549
19 32057403690640189635
20 381573145993865438254

List of values

[1, 3, 31, 317, 3399, 37418, 419229, 4756104, 54463335, 628197809, 7287712566, 84942987198, 993941174829, 11668806723876, 137378189197112, 1621322803014672, 19175540677541991, 227217662222902443, 2696878158795639549, 32057403690640189635, 381573145993865438254]

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

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