cp's OEIS Frontend

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.

A346410 a(n) = (n!)^2 * Sum_{k=0..n-1} 1 / ((n-k) * k!)^2.

Table of values

n a(n)
0 0
1 1
2 5
3 22
4 152
5 2001
6 45097
7 1527506
8 71864928
9 4466430513
10 353828600029
11 34770661312190
12 4148422395161464
13 590479899466175681
14 98824492409739430401
15 19209838771051338898234
16 4291488438323868507946880
17 1091819942877526843993466529
18 313819508664449992611846900981

List of values

[0, 1, 5, 22, 152, 2001, 45097, 1527506, 71864928, 4466430513, 353828600029, 34770661312190, 4148422395161464, 590479899466175681, 98824492409739430401, 19209838771051338898234, 4291488438323868507946880, 1091819942877526843993466529, 313819508664449992611846900981]

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

Content is available under The OEIS End-User License Agreement.