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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.

A250913 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

Table of values

n a(n)
1 74
2 603
3 603
4 4909
5 13401
6 4909
7 39960
8 297873
9 297873
10 39960
11 325277
12 6621219
13 18077319
14 6621219
15 325277
16 2647773
17 147178899
18 1096982379
19 1096982379
20 147178899
21 2647773
22 21553018
23 3271547025
24 66566704705
25 181725094746

List of values

[74, 603, 603, 4909, 13401, 4909, 39960, 297873, 297873, 39960, 325277, 6621219, 18077319, 6621219, 325277, 2647773, 147178899, 1096982379, 1096982379, 147178899, 2647773, 21553018, 3271547025, 66566704705, 181725094746]

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

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