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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.

A266735 Number of words on {1,1,2,2,3,3,...,n,n} avoiding the pattern 12345.

Table of values

n a(n)
0 1
1 1
2 6
3 90
4 2520
5 102011
6 5176504
7 307027744
8 20472135280
9 1496594831506
10 117857270562568
11 9869468603141427
12 870255083860881152
13 80185525536941657225
14 7673807618627318341436
15 759049283017632212000140
16 77292554293281131959377376
17 8075621155990277422800518076

List of values

[1, 1, 6, 90, 2520, 102011, 5176504, 307027744, 20472135280, 1496594831506, 117857270562568, 9869468603141427, 870255083860881152, 80185525536941657225, 7673807618627318341436, 759049283017632212000140, 77292554293281131959377376, 8075621155990277422800518076]

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

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