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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.

A270756 Total sum of the sizes of all blocks with maximal element 2 in all set partitions of {1,2,...,n}.

Table of values

n a(n)
2 3
3 4
4 9
5 25
6 82
7 307
8 1283
9 5894
10 29427
11 158269
12 910520
13 5570737
14 36071631
15 246188196
16 1764757189
17 13246059237
18 103825154098
19 847806545767
20 7196895817375
21 63389642645486
22 578318132627495
23 5456455370760825
24 53165437331978992
25 534262881004973981

List of values

[3, 4, 9, 25, 82, 307, 1283, 5894, 29427, 158269, 910520, 5570737, 36071631, 246188196, 1764757189, 13246059237, 103825154098, 847806545767, 7196895817375, 63389642645486, 578318132627495, 5456455370760825, 53165437331978992, 534262881004973981]

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

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