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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.

A270765 Total sum of the sizes of all blocks with minimal element 2 in all set partitions of {1,2,...,n}.

Table of values

n a(n)
2 1
3 4
4 16
5 67
6 299
7 1429
8 7307
9 39848
10 230884
11 1416047
12 9160977
13 62316137
14 444424965
15 3314372728
16 25786012724
17 208842481687
18 1757367578867
19 15337268316933
20 138603393210479
21 1295082562497364
22 12494759080718152
23 124314054484739035
24 1274003246005735449

List of values

[1, 4, 16, 67, 299, 1429, 7307, 39848, 230884, 1416047, 9160977, 62316137, 444424965, 3314372728, 25786012724, 208842481687, 1757367578867, 15337268316933, 138603393210479, 1295082562497364, 12494759080718152, 124314054484739035, 1274003246005735449]

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

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