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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.

A264273 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Table of values

n a(n)
1 9
2 48
3 256
4 1280
5 6400
6 32000
7 160000
8 800000
9 4000000
10 20000000
11 100000000
12 500000000
13 2500000000
14 12500000000
15 62500000000
16 312500000000
17 1562500000000
18 7812500000000
19 39062500000000
20 195312500000000
21 976562500000000

List of values

[9, 48, 256, 1280, 6400, 32000, 160000, 800000, 4000000, 20000000, 100000000, 500000000, 2500000000, 12500000000, 62500000000, 312500000000, 1562500000000, 7812500000000, 39062500000000, 195312500000000, 976562500000000]

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

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