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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.

A384171 a(n) = 2^n * n! * binomial(5*n/2,n) * Sum_{k=1..n} 1/(3*n+2*k).

Table of values

n a(n)
1 1
2 18
3 503
4 19312
5 946009
6 56419200
7 3967700295
8 321506211840
9 29497821190065
10 3022798062551040
11 342204383046633975
12 42414460290839347200
13 5712600791700063700425
14 830773593435129407078400
15 129744737403826992957167175
16 21657021896289762215460864000
17 3847769544999445159548440534625

List of values

[1, 18, 503, 19312, 946009, 56419200, 3967700295, 321506211840, 29497821190065, 3022798062551040, 342204383046633975, 42414460290839347200, 5712600791700063700425, 830773593435129407078400, 129744737403826992957167175, 21657021896289762215460864000, 3847769544999445159548440534625]

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

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