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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.

A264551 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

Table of values

n a(n)
1 1
2 2
3 6
4 16
5 40
6 96
7 240
8 608
9 1536
10 3840
11 9600
12 24064
13 60416
14 151552
15 379904
16 952320
17 2387968
18 5988352
19 15015936
20 37650432
21 94404608
22 236716032
23 593559552
24 1488322560
25 3731881984
26 9357492224
27 23463460864
28 58833502208
29 147522060288

List of values

[1, 2, 6, 16, 40, 96, 240, 608, 1536, 3840, 9600, 24064, 60416, 151552, 379904, 952320, 2387968, 5988352, 15015936, 37650432, 94404608, 236716032, 593559552, 1488322560, 3731881984, 9357492224, 23463460864, 58833502208, 147522060288]

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

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