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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.

A264471 Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 1,0 2,1 or -1,-1.

Table of values

n a(n)
1 0
2 4
3 6
4 16
5 49
6 124
7 384
8 1041
9 2868
10 8189
11 22760
12 63910
13 179095
14 500979
15 1405340
16 3935526
17 11024880
18 30892270
19 86537090
20 242454683
21 679254490
22 1902958308
23 5331384633
24 14936238820
25 41845207329
26 117233159460
27 328438385380

List of values

[0, 4, 6, 16, 49, 124, 384, 1041, 2868, 8189, 22760, 63910, 179095, 500979, 1405340, 3935526, 11024880, 30892270, 86537090, 242454683, 679254490, 1902958308, 5331384633, 14936238820, 41845207329, 117233159460, 328438385380]

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

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