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.

A151652 Number of permutations of 6 indistinguishable copies of 1..n with exactly 3 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 400
3 233300
4 35138736
5 3656408776
6 333546436832
7 28929582376716
8 2460253392551584
9 207633993378572384
10 17472055390759340592
11 1468614660871788474628
12 123393355120299525767120
13 10365952122947333091123000
14 870767651291136123846763456
15 73145318723749749228550353212

List of values

[0, 400, 233300, 35138736, 3656408776, 333546436832, 28929582376716, 2460253392551584, 207633993378572384, 17472055390759340592, 1468614660871788474628, 123393355120299525767120, 10365952122947333091123000, 870767651291136123846763456, 73145318723749749228550353212]

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

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