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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.

A264677 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,-1 1,0 -1,-2 -2,-2 or 0,1.

Table of values

n a(n)
1 1
2 2
3 10
4 29
5 75
6 201
7 588
8 1700
9 4785
10 13401
11 37905
12 107598
13 304638
14 860789
15 2433555
16 6885713
17 19483112
18 55110392
19 155875521
20 440924465
21 1247301569
22 3528321578
23 9980556450
24 28232081677
25 79861067099
26 225905953689
27 639026458132

List of values

[1, 2, 10, 29, 75, 201, 588, 1700, 4785, 13401, 37905, 107598, 304638, 860789, 2433555, 6885713, 19483112, 55110392, 155875521, 440924465, 1247301569, 3528321578, 9980556450, 28232081677, 79861067099, 225905953689, 639026458132]

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

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