A222515 Number of 7Xn 0..1 arrays with exactly floor(7Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.
0, 144, 1335, 15420, 128889, 2220730, 19892241, 385142640, 3707833063, 76288704212, 767768563690, 16265595620923, 167593171246145, 3601551682848558, 37565287343451014, 813220525871238420
Offset: 1
Keywords
Examples
Some solutions for n=3 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..1....0..0..0....0..0..0 ..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0 ..0..0..1....0..0..0....0..0..0....1..0..0....0..0..0....0..0..0....0..0..0 ..0..0..0....0..1..0....0..0..1....0..0..1....0..0..0....0..0..0....0..0..0 ..0..0..1....0..1..1....1..0..0....1..0..0....1..0..1....0..1..0....0..0..1 ..0..0..1....1..1..1....0..1..0....0..0..0....0..0..0....0..0..1....0..1..1 ..1..0..0....0..1..1....1..1..1....0..0..1....1..0..0....0..0..1....0..0..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..17
Comments