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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.

A097342 a(n) = Sum_{k=0..floor(n/2)} Stirling2(n-k,k) * 3^k.

Table of values

n a(n)
0 1
1 0
2 3
3 3
4 12
5 30
6 93
7 300
8 1038
9 3810
10 14781
11 60375
12 258807
13 1160949
14 5435652
15 26502555
16 134282406
17 705720549
18 3840542031
19 21608662710
20 125523530724
21 751831408929
22 4637611255422
23 29428408797852
24 191907975348210

List of values

[1, 0, 3, 3, 12, 30, 93, 300, 1038, 3810, 14781, 60375, 258807, 1160949, 5435652, 26502555, 134282406, 705720549, 3840542031, 21608662710, 125523530724, 751831408929, 4637611255422, 29428408797852, 191907975348210]

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

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