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.

A264880 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-1 -2,0 or 1,1.

Table of values

n a(n)
1 1
2 0
3 5
4 4
5 65
6 228
7 1101
8 4832
9 18501
10 79088
11 306617
12 1273740
13 5039669
14 20532112
15 82109789
16 331870404
17 1333905993
18 5375261200
19 21637089445
20 87118807544
21 350809834405
22 1412328072196
23 5687276800137
24 22897079312012
25 92199483148325

List of values

[1, 0, 5, 4, 65, 228, 1101, 4832, 18501, 79088, 306617, 1273740, 5039669, 20532112, 82109789, 331870404, 1333905993, 5375261200, 21637089445, 87118807544, 350809834405, 1412328072196, 5687276800137, 22897079312012, 92199483148325]

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

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