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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.

A343707 a(n) = 1 + 2 * Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).

Table of values

n a(n)
0 1
1 3
2 15
3 113
4 1145
5 14539
6 221663
7 3943281
8 80173345
9 1833831619
10 46606646175
11 1302954958689
12 39737420405753
13 1312901360002283
14 46714233470065999
15 1780859204826798401
16 72416689888874547969
17 3128792006916853876291
18 143132514626658326870767
19 6911638338982428907738641

List of values

[1, 3, 15, 113, 1145, 14539, 221663, 3943281, 80173345, 1833831619, 46606646175, 1302954958689, 39737420405753, 1312901360002283, 46714233470065999, 1780859204826798401, 72416689888874547969, 3128792006916853876291, 143132514626658326870767, 6911638338982428907738641]

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

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