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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.

A336270 a(n) = Sum_{k=0..n} Sum_{j=0..k} (binomial(n,k) * binomial(k,j))^n.

Table of values

n a(n)
0 1
1 3
2 15
3 381
4 67635
5 83118753
6 813824623689
7 58040410068847251
8 32150480245981639533315
9 154935057570894645075940703673
10 5474671509704049919709361235659936825
11 1600436120524545216094358662984789029130593831

List of values

[1, 3, 15, 381, 67635, 83118753, 813824623689, 58040410068847251, 32150480245981639533315, 154935057570894645075940703673, 5474671509704049919709361235659936825, 1600436120524545216094358662984789029130593831]

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

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