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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.

A383121 a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(n,k) * binomial(n*k,k).

Table of values

n a(n)
0 1
1 0
2 3
3 47
4 1093
5 33029
6 1236781
7 55325416
8 2879987209
9 171061709417
10 11418368571721
11 846230146390001
12 68949300160035373
13 6126085419697733567
14 589470974371501065845
15 61068847238080533844679
16 6777270943578364524130321
17 802138434294752321142680145

List of values

[1, 0, 3, 47, 1093, 33029, 1236781, 55325416, 2879987209, 171061709417, 11418368571721, 846230146390001, 68949300160035373, 6126085419697733567, 589470974371501065845, 61068847238080533844679, 6777270943578364524130321, 802138434294752321142680145]

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

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