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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.

A293318 a(n) = (2*n)! * [x^(2*n)] (-log(sqrt(1 - 2*x)))^n/(sqrt(1 - 2*x)*n!).

Table of values

n a(n)
0 1
1 4
2 86
3 3480
4 208054
5 16486680
6 1628301884
7 192666441968
8 26569595376038
9 4184718381424152
10 741138328282003860
11 145795774074768177360
12 31540994233548116475196
13 7442380580681963411363440
14 1902155375416975061879918520
15 523496081998297020687019596000

List of values

[1, 4, 86, 3480, 208054, 16486680, 1628301884, 192666441968, 26569595376038, 4184718381424152, 741138328282003860, 145795774074768177360, 31540994233548116475196, 7442380580681963411363440, 1902155375416975061879918520, 523496081998297020687019596000]

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

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