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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.

A387310 a(n) = Sum_{k=0..n} 3^k * binomial(n+2,k+2) * binomial(2*k+4,k+4).

Table of values

n a(n)
0 1
1 21
2 330
3 4690
4 63690
5 844662
6 11052496
7 143462592
8 1852852365
9 23853938185
10 306473670822
11 3932435239278
12 50417223635233
13 646085510253645
14 8277409340709240
15 106037993391958936
16 1358437551566242347
17 17404555385537336583
18 223025734596708637750
19 2858460480570547144110

List of values

[1, 21, 330, 4690, 63690, 844662, 11052496, 143462592, 1852852365, 23853938185, 306473670822, 3932435239278, 50417223635233, 646085510253645, 8277409340709240, 106037993391958936, 1358437551566242347, 17404555385537336583, 223025734596708637750, 2858460480570547144110]

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

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