cp's OEIS Frontend

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.

A266738 Number of words on {1,1,1,2,2,2,3,3,3,4,4,4,...,n,n,n} avoiding the pattern 12345.

Table of values

n a(n)
0 1
1 1
2 20
3 1680
4 369600
5 117392909
6 46121962742
7 21198300356500
8 11003612776114008
9 6290031043253973544
10 3887357166155963541538
11 2562077915376091538040250
12 1782153151031487742187453640
13 1297781266782084301101836538690
14 983066960483171632842827775906144

List of values

[1, 1, 20, 1680, 369600, 117392909, 46121962742, 21198300356500, 11003612776114008, 6290031043253973544, 3887357166155963541538, 2562077915376091538040250, 1782153151031487742187453640, 1297781266782084301101836538690, 983066960483171632842827775906144]

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

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