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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.

A387369 a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(n+2,k) * binomial(n+2,n-k).

Table of values

n a(n)
0 1
1 15
2 174
3 1850
4 18915
5 189525
6 1877596
7 18476820
8 181083285
9 1770245675
10 17278828842
11 168496597230
12 1642259489143
13 16002398658225
14 155919866646840
15 1519307275471400
16 14806582620440553
17 144329229195062535
18 1407215890063071910
19 13724133021646678050
20 133885448856624266571

List of values

[1, 15, 174, 1850, 18915, 189525, 1877596, 18476820, 181083285, 1770245675, 17278828842, 168496597230, 1642259489143, 16002398658225, 155919866646840, 1519307275471400, 14806582620440553, 144329229195062535, 1407215890063071910, 13724133021646678050, 133885448856624266571]

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

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