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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.

A264366 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,2 1,0 or -1,-2.

Table of values

n a(n)
1 1
2 6
3 36
4 120
5 400
6 1440
7 5184
8 18432
9 65536
10 233472
11 831744
12 2962176
13 10549504
14 37572864
15 133818624
16 476601600
17 1697440000
18 6045523200
19 21531453696
20 76685407488
21 273119121664
22 972728179968
23 3464422799616
24 12338724758784

List of values

[1, 6, 36, 120, 400, 1440, 5184, 18432, 65536, 233472, 831744, 2962176, 10549504, 37572864, 133818624, 476601600, 1697440000, 6045523200, 21531453696, 76685407488, 273119121664, 972728179968, 3464422799616, 12338724758784]

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

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