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.

A250907 Number of (n+1) X (2+1) 0..2 arrays with no 2 X 2 subblock having its maximum diagonal element less than its minimum antidiagonal element.

Table of values

n a(n)
1 603
2 13401
3 297873
4 6621219
5 147178899
6 3271547025
7 72721157625
8 1616472795339
9 35931555318411
10 798699904707465
11 17753796965556513
12 394637967071813043
13 8772158730705164739
14 194990789577739653441
15 4334327408721425197833

List of values

[603, 13401, 297873, 6621219, 147178899, 3271547025, 72721157625, 1616472795339, 35931555318411, 798699904707465, 17753796965556513, 394637967071813043, 8772158730705164739, 194990789577739653441, 4334327408721425197833]

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

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