cp's OEIS Frontend

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.

A232591 Number of (2+1) X (n+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally or antidiagonally, with no adjacent elements equal.

Table of values

n a(n)
1 2
2 34
3 12
4 152
5 108
6 690
7 744
8 3232
9 4516
10 15592
11 25724
12 76914
13 141516
14 385622
15 762648
16 1955944
17 4058152
18 10001440
19 21421592
20 51425362
21 112496648
22 265415854
23 588810972
24 1373336224
25 3075128652
26 7118096080
27 16037159652
28 36935382354

List of values

[2, 34, 12, 152, 108, 690, 744, 3232, 4516, 15592, 25724, 76914, 141516, 385622, 762648, 1955944, 4058152, 10001440, 21421592, 51425362, 112496648, 265415854, 588810972, 1373336224, 3075128652, 7118096080, 16037159652, 36935382354]

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

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