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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.

A384170 a(n) = 3^n * n! * binomial(5*n/3,n) * Sum_{k=1..n} 1/(2*n+3*k).

Table of values

n a(n)
1 1
2 17
3 423
4 14198
5 603194
6 31069980
7 1882538440
8 131223122480
9 10345975290000
10 910393948446560
11 88452245803947200
12 9405081915991747200
13 1086351888729412883200
14 135456246872643979788800
15 18134220756665496528460800
16 2594357788916663689703168000
17 395006034401484168868002560000

List of values

[1, 17, 423, 14198, 603194, 31069980, 1882538440, 131223122480, 10345975290000, 910393948446560, 88452245803947200, 9405081915991747200, 1086351888729412883200, 135456246872643979788800, 18134220756665496528460800, 2594357788916663689703168000, 395006034401484168868002560000]

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

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