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.

A177656 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, up, up, up.

Table of values

n a(n)
0 1
1 1
2 70
3 34650
4 63063000
5 305540235000
6 3244063941457921
7 66318107269696031401
8 2379613992603610298990440
9 139801056431706089952638689800
10 12738104011291233355807195325583000
11 1723542569871737348415590682638868511200

List of values

[1, 1, 70, 34650, 63063000, 305540235000, 3244063941457921, 66318107269696031401, 2379613992603610298990440, 139801056431706089952638689800, 12738104011291233355807195325583000, 1723542569871737348415590682638868511200]

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

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