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.

A151607 Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 150
3 2763
4 28236
5 251205
6 2116386
7 17292639
8 138352920
9 1089544473
10 8474253870
11 65251778163
12 498286334052
13 3778671399789
14 28485369052602
15 213640267939335
16 1595180667331632
17 11864156213337153
18 87934334287152582
19 649737025566256155
20 4787535977856705660

List of values

[0, 150, 2763, 28236, 251205, 2116386, 17292639, 138352920, 1089544473, 8474253870, 65251778163, 498286334052, 3778671399789, 28485369052602, 213640267939335, 1595180667331632, 11864156213337153, 87934334287152582, 649737025566256155, 4787535977856705660]

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

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