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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.

A266739 Number of words on {1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,...,n,n,n,n} avoiding the pattern 123.

Table of values

n a(n)
0 1
1 1
2 70
3 3199
4 173860
5 10203181
6 631326526
7 40553993125
8 2678871322640
9 180830423671450
10 12418980645870820
11 864996624914197495
12 60957211831578399100
13 4338372535640598835279
14 311386494956413595138930
15 22513820432313175983170649
16 1638226907374445245497453464

List of values

[1, 1, 70, 3199, 173860, 10203181, 631326526, 40553993125, 2678871322640, 180830423671450, 12418980645870820, 864996624914197495, 60957211831578399100, 4338372535640598835279, 311386494956413595138930, 22513820432313175983170649, 1638226907374445245497453464]

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

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