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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.

A271207 Number of set partitions of [n] avoiding triples (t,t+1,t+2) having t+i in block b+i for some b.

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 10
5 28
6 89
7 315
8 1233
9 5285
10 24583
11 123062
12 658335
13 3741625
14 22483415
15 142264589
16 944652336
17 6562959239
18 47583055191
19 359196368057
20 2817394708454
21 22919157785777
22 193045807856919
23 1681025045594032
24 15112573721911697
25 140088106892677440

List of values

[1, 1, 2, 4, 10, 28, 89, 315, 1233, 5285, 24583, 123062, 658335, 3741625, 22483415, 142264589, 944652336, 6562959239, 47583055191, 359196368057, 2817394708454, 22919157785777, 193045807856919, 1681025045594032, 15112573721911697, 140088106892677440]

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

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