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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.

A266737 Number of words on {1,1,1,2,2,2,3,3,3,4,4,4,...,n,n,n} avoiding the pattern 1234.

Table of values

n a(n)
0 1
1 1
2 20
3 1680
4 173891
5 21347262
6 2977892253
7 455912368540
8 74876841353159
9 12990339123973119
10 2354973430941967605
11 442587722191655715108
12 85717352536181708342445
13 17029266882947116165470103
14 3457866959157770598680361537
15 715559803849259851987691458500

List of values

[1, 1, 20, 1680, 173891, 21347262, 2977892253, 455912368540, 74876841353159, 12990339123973119, 2354973430941967605, 442587722191655715108, 85717352536181708342445, 17029266882947116165470103, 3457866959157770598680361537, 715559803849259851987691458500]

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

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