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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.

A264477 Number of (3+1)X(n+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 57
6 160
7 484
8 1449
9 4250
10 12736
11 37980
12 112684
13 335528
14 998929
15 2971856
16 8844112
17 26318889
18 78319204
19 233069764
20 693574740
21 2063954658
22 6142018600
23 18277651737
24 54391278960
25 161859683044
26 481668191001
27 1433366397054

List of values

[0, 4, 6, 16, 57, 160, 484, 1449, 4250, 12736, 37980, 112684, 335528, 998929, 2971856, 8844112, 26318889, 78319204, 233069764, 693574740, 2063954658, 6142018600, 18277651737, 54391278960, 161859683044, 481668191001, 1433366397054]

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

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