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.

A177322 Number of permutations of n copies of 1..4 with all adjacent differences <= 2 in absolute value.

Table of values

n a(n)
0 1
1 12
2 660
3 51240
4 4635540
5 457507512
6 47768769048
7 5188083048720
8 580132098966420
9 66341857216154520
10 7722843117550721160
11 912113857017595941072
12 109025503164832356811800
13 13164173606420256001705200
14 1603262885152270822600633200
15 196721396289915224779758846240

List of values

[1, 12, 660, 51240, 4635540, 457507512, 47768769048, 5188083048720, 580132098966420, 66341857216154520, 7722843117550721160, 912113857017595941072, 109025503164832356811800, 13164173606420256001705200, 1603262885152270822600633200, 196721396289915224779758846240]

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

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