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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.

A357925 a(n) = Sum_{k=0..floor(n/3)} Stirling2(n - 2*k,n - 3*k).

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 4
6 7
7 12
8 23
9 47
10 95
11 192
12 402
13 869
14 1898
15 4181
16 9379
17 21431
18 49556
19 115770
20 273919
21 656476
22 1590061
23 3888783
24 9608337
25 23980678
26 60402964
27 153469477
28 393325442
29 1016628823
30 2648842279
31 6955029849
32 18400676786
33 49042936328
34 131646082259

List of values

[1, 1, 1, 1, 2, 4, 7, 12, 23, 47, 95, 192, 402, 869, 1898, 4181, 9379, 21431, 49556, 115770, 273919, 656476, 1590061, 3888783, 9608337, 23980678, 60402964, 153469477, 393325442, 1016628823, 2648842279, 6955029849, 18400676786, 49042936328, 131646082259]

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

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