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.

A199245 Number of nX7 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.

This page as a plain text file.
%I A199245 #6 Jul 22 2025 13:15:49
%S A199245 19,288,2080,134821,3190670,27337776,2013526831,52332203186
%N A199245 Number of nX7 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or two horizontal or vertical neighbors.
%C A199245 Column 7 of A199246
%e A199245 Some solutions for n=4
%e A199245 ..0..1..0..1..0..0..2....0..1..0..2..0..2..1....0..1..0..2..0..1..2
%e A199245 ..2..0..1..2..0..0..1....1..0..1..0..2..1..2....1..0..2..0..1..2..0
%e A199245 ..0..2..0..1..1..2..2....0..2..0..2..1..2..1....0..1..0..1..2..0..2
%e A199245 ..1..0..2..1..1..2..2....2..0..1..0..2..1..2....1..2..1..2..1..2..0
%K A199245 nonn
%O A199245 1,1
%A A199245 _R. H. Hardin_ Nov 04 2011

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

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