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.

A151630 Number of permutations of 2 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 1
6 37257
7 49258935
8 19323413187
9 3950966047950
10 539417838175698
11 56160822639510114
12 4828612774471173450
13 360918591663105680031
14 24285778099889122541071
15 1507815882167268489272385
16 87937588306397361416746005
17 4882223035755085016119166100

List of values

[0, 0, 0, 0, 1, 37257, 49258935, 19323413187, 3950966047950, 539417838175698, 56160822639510114, 4828612774471173450, 360918591663105680031, 24285778099889122541071, 1507815882167268489272385, 87937588306397361416746005, 4882223035755085016119166100]

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

Content is available under The OEIS End-User License Agreement.