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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.

A266736 Number of words on {1,1,1,2,2,2,3,3,3,4,4,4,...,n,n,n} avoiding the pattern 123.

Table of values

n a(n)
0 1
1 1
2 20
3 374
4 8124
5 190893
6 4727788
7 121543500
8 3212914524
9 86782926068
10 2384725558736
11 66456350375566
12 1873703883228900
13 53351152389518550
14 1531960347453263112
15 44311785923563130392
16 1289909841595078198172
17 37760636720455988917420
18 1110927659386926734186992

List of values

[1, 1, 20, 374, 8124, 190893, 4727788, 121543500, 3212914524, 86782926068, 2384725558736, 66456350375566, 1873703883228900, 53351152389518550, 1531960347453263112, 44311785923563130392, 1289909841595078198172, 37760636720455988917420, 1110927659386926734186992]

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

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