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.

A151639 Number of permutations of 3 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 1722320
6 21475242671
7 53885342499340
8 59751188387945950
9 40765121565728774056
10 20317575263352346466495
11 8176401371550779497913310
12 2829198944755856389638829950
13 877500019282729363773560673680
14 251039391334595768636642931100892

List of values

[0, 0, 0, 1, 1722320, 21475242671, 53885342499340, 59751188387945950, 40765121565728774056, 20317575263352346466495, 8176401371550779497913310, 2829198944755856389638829950, 877500019282729363773560673680, 251039391334595768636642931100892]

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

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