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.

A177646 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, up, up.

Table of values

n a(n)
0 1
1 1
2 70
3 34650
4 63063000
5 302857024681
6 3171644273043481
7 63767771149790231020
8 2246276459710030995597000
9 129398739548198780715411006000
10 11551019408580550906836084615390361
11 1530266028377887010801240993038984544961
12 290384391726747532382877490399579938116889720

List of values

[1, 1, 70, 34650, 63063000, 302857024681, 3171644273043481, 63767771149790231020, 2246276459710030995597000, 129398739548198780715411006000, 11551019408580550906836084615390361, 1530266028377887010801240993038984544961, 290384391726747532382877490399579938116889720]

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

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