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.

A264678 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.

Table of values

n a(n)
1 0
2 9
3 34
4 123
5 748
6 3698
7 17443
8 84737
9 414665
10 2005125
11 9713004
12 47127519
13 228570355
14 1108064547
15 5372882058
16 26053821399
17 126333862510
18 612577288197
19 2970352085648
20 14403091243503
21 69839730071000
22 338648374694336

List of values

[0, 9, 34, 123, 748, 3698, 17443, 84737, 414665, 2005125, 9713004, 47127519, 228570355, 1108064547, 5372882058, 26053821399, 126333862510, 612577288197, 2970352085648, 14403091243503, 69839730071000, 338648374694336]

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

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