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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.

A268751 Number of sequences with n copies each of 1,2,...,n avoiding the pattern 12...n.

Table of values

n a(n)
0 0
1 0
2 1
3 374
4 16140983
5 173996758190594
6 791857392420720220446647
7 2285085934263252199073238394141449534
8 5841526335200139692050292842849347521755651331941759
9 17585875137049122003330684747231440185032966840579881629527695901745706

List of values

[0, 0, 1, 374, 16140983, 173996758190594, 791857392420720220446647, 2285085934263252199073238394141449534, 5841526335200139692050292842849347521755651331941759, 17585875137049122003330684747231440185032966840579881629527695901745706]

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

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