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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.

A357833 a(n) = Sum_{k=0..floor((n-2)/3)} 2^k * |Stirling1(n,3*k+2)|.

Table of values

n a(n)
0 0
1 0
2 1
3 3
4 11
5 52
6 304
7 2114
8 16992
9 154626
10 1568706
11 17535108
12 213965520
13 2828584824
14 40259041188
15 613656673476
16 9971942784132
17 172071391424832
18 3141974627361216
19 60523400730707208
20 1226519845766281008
21 26084378634267048984
22 580854626450078463000

List of values

[0, 0, 1, 3, 11, 52, 304, 2114, 16992, 154626, 1568706, 17535108, 213965520, 2828584824, 40259041188, 613656673476, 9971942784132, 172071391424832, 3141974627361216, 60523400730707208, 1226519845766281008, 26084378634267048984, 580854626450078463000]

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

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