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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.

A204630 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order.

Table of values

n a(n)
1 12
2 96
3 96
4 768
5 2049
6 768
7 6144
8 43734
9 43734
10 6144
11 49152
12 933462
13 2490558
14 933462
15 49152
16 393216
17 19923888
18 141832254
19 141832254
20 19923888
21 393216
22 3145728
23 425257068
24 8077061502
25 21550390395
26 8077061502
27 425257068
28 3145728
29 25165824

List of values

[12, 96, 96, 768, 2049, 768, 6144, 43734, 43734, 6144, 49152, 933462, 2490558, 933462, 49152, 393216, 19923888, 141832254, 141832254, 19923888, 393216, 3145728, 425257068, 8077061502, 21550390395, 8077061502, 425257068, 3145728, 25165824]

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

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