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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.

A294117 a(n) = (n!)^2 * Sum_{k=1..n} binomial(n,k) / k^2.

Table of values

n a(n)
1 1
2 9
3 139
4 3460
5 129076
6 6831216
7 492314544
8 46810296576
9 5724123883776
10 881047053849600
11 167511790501401600
12 38685942660873830400
13 10689310289146278297600
14 3485920800452969462169600
15 1325434521073620201431040000
16 581241452210335678204477440000

List of values

[1, 9, 139, 3460, 129076, 6831216, 492314544, 46810296576, 5724123883776, 881047053849600, 167511790501401600, 38685942660873830400, 10689310289146278297600, 3485920800452969462169600, 1325434521073620201431040000, 581241452210335678204477440000]

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

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