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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.

A264167 Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,1 1,0 -2,-1 or -1,-2.

Table of values

n a(n)
1 4
2 25
3 98
4 418
5 1862
6 8007
7 34539
8 149808
9 648436
10 2805250
11 12142877
12 52558637
13 227471330
14 984523558
15 4261166714
16 18442796291
17 79822557139
18 345481774068
19 1495286247768
20 6471776351478
21 28010620722521
22 121233307002413

List of values

[4, 25, 98, 418, 1862, 8007, 34539, 149808, 648436, 2805250, 12142877, 52558637, 227471330, 984523558, 4261166714, 18442796291, 79822557139, 345481774068, 1495286247768, 6471776351478, 28010620722521, 121233307002413]

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

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