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.

A251220 Number of (n+1) X (n+1) 0..1 arrays with no 2 X 2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements.

Table of values

n a(n)
1 14
2 305
3 20782
4 4462968
5 3007738372
6 6373427948731
7 42432102644410392
8 887822645668106069016
9 58374742677350528694024651
10 12061621459257582136492647314788
11 7831831916823870434473136772446378463

List of values

[14, 305, 20782, 4462968, 3007738372, 6373427948731, 42432102644410392, 887822645668106069016, 58374742677350528694024651, 12061621459257582136492647314788, 7831831916823870434473136772446378463]

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

Content is available under The OEIS End-User License Agreement.