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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.

A137729 Number of circular permutations of the multiset {1,1,2,2,...,n,n} (up to rotations).

Table of values

n a(n)
0 1
1 1
2 2
3 16
4 318
5 11352
6 623760
7 48648960
8 5108105520
9 694702028160
10 118794043549440
11 24946749109094400
12 6311527524161798400
13 1893458257242791500800
14 664603848292138865510400
15 269829162406607158901145600

List of values

[1, 1, 2, 16, 318, 11352, 623760, 48648960, 5108105520, 694702028160, 118794043549440, 24946749109094400, 6311527524161798400, 1893458257242791500800, 664603848292138865510400, 269829162406607158901145600]

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

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