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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.

A355292 a(n) = Sum_{k=1..n} |Stirling1(n,k)| * Catalan(k-1).

Table of values

n a(n)
1 1
2 2
3 7
4 34
5 208
6 1521
7 12871
8 123306
9 1316316
10 15471114
11 198319614
12 2751524557
13 41058030388
14 655427422651
15 11142214939181
16 200919300509214
17 3829751956014084
18 76928721540858772
19 1624015067086462504
20 35942784684670110710
21 832134062464902004336

List of values

[1, 2, 7, 34, 208, 1521, 12871, 123306, 1316316, 15471114, 198319614, 2751524557, 41058030388, 655427422651, 11142214939181, 200919300509214, 3829751956014084, 76928721540858772, 1624015067086462504, 35942784684670110710, 832134062464902004336]

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

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