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.

A240512 Number of n X n 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order.

This page as a plain text file.
%I A240512 #7 Jun 26 2025 11:20:25
%S A240512 1,3,10,99,1376,37624,1906245,180760099,31517059634,10196460883584
%N A240512 Number of n X n 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order.
%C A240512 Diagonal of A240519.
%e A240512 Some solutions for n=4
%e A240512 ..0..1..0..1....0..1..0..1....0..1..0..1....0..1..1..1....0..1..0..1
%e A240512 ..1..0..1..0....0..1..1..0....1..1..1..0....0..0..1..0....1..1..0..0
%e A240512 ..0..1..0..1....1..1..0..1....0..0..0..1....0..1..0..1....0..1..0..1
%e A240512 ..1..0..1..0....0..1..0..1....1..0..1..0....1..0..1..0....1..0..1..0
%Y A240512 Cf. A240519.
%K A240512 nonn
%O A240512 1,2
%A A240512 _R. H. Hardin_, Apr 06 2014

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

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