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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.

A177472 Number of permutations of order n avoiding the consecutive pattern 11'2'2.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 18
5 71
6 322
7 1665
8 9789
9 64327
10 468914
11 3748920
12 32699022
13 308710917
14 3138821688
15 34186918427
16 397173376849
17 4902547569617
18 64073734206528
19 883940288032392
20 12836250526983672
21 195724485831901029
22 3126468139092090818
23 52211816154041174670
24 909843384081141844312

List of values

[1, 1, 2, 6, 18, 71, 322, 1665, 9789, 64327, 468914, 3748920, 32699022, 308710917, 3138821688, 34186918427, 397173376849, 4902547569617, 64073734206528, 883940288032392, 12836250526983672, 195724485831901029, 3126468139092090818, 52211816154041174670, 909843384081141844312]

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

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