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.

A151649 Number of permutations of 5 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 25
3 182700
4 84646275
5 18746073375
6 3085105337250
7 443146794326775
8 59593466814021450
9 7756190980563441400
10 993121304532091347375
11 126129019383244869440750
12 15954027727693152179563525
13 2014001281330236936094898325
14 253995299147567448467485168400

List of values

[0, 25, 182700, 84646275, 18746073375, 3085105337250, 443146794326775, 59593466814021450, 7756190980563441400, 993121304532091347375, 126129019383244869440750, 15954027727693152179563525, 2014001281330236936094898325, 253995299147567448467485168400]

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

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