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.

A151638 Number of permutations of 3 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
4 243
5 12750255
6 40396577931
7 41106807537048
8 22745757394235250
9 8699569720553953791
10 2617057246555282014495
11 668634213456480163469985
12 152325974081288304581227794
13 31960987230978975148286275260
14 6315174416665212479526100114476

List of values

[0, 0, 0, 243, 12750255, 40396577931, 41106807537048, 22745757394235250, 8699569720553953791, 2617057246555282014495, 668634213456480163469985, 152325974081288304581227794, 31960987230978975148286275260, 6315174416665212479526100114476]

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

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