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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.

A213697 T(n,k)=Half the number of (n+1)X(n+1) symmetric 0..k arrays with no 2X2 subblock summing to 2k.

Table of values

n a(n)
1 3
2 11
3 13
4 28
5 192
6 70
7 56
8 1320
9 7827
10 529
11 99
12 5470
13 208072
14 750261
15 5148
16 159
17 17499
18 2322599
19 109820000
20 168382284
21 68798
22 240
23 45892
24 16537086
25 4286833981
26 193946752094
27 88681187619
28 1220409
29 344
30 105856
31 84059234
32 83545858925

List of values

[3, 11, 13, 28, 192, 70, 56, 1320, 7827, 529, 99, 5470, 208072, 750261, 5148, 159, 17499, 2322599, 109820000, 168382284, 68798, 240, 45892, 16537086, 4286833981, 193946752094, 88681187619, 1220409, 344, 105856, 84059234, 83545858925]

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

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