A208708 Number of nX7 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.
64, 4516, 334948, 24754628, 1830045552, 135288700496, 10001404535216, 739367693888784, 54658781788350480, 4040726220144359312, 298716287704524626960, 22083015695332916533648, 1632517550173528777448208
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..0..0..1..0..1..0....0..0..1..0..1..1..1....0..0..0..0..0..1..1 ..0..1..1..0..1..1..0....0..0..1..1..0..1..1....0..1..0..1..1..0..1 ..1..0..0..0..1..0..0....0..1..0..0..1..0..0....1..1..1..0..0..1..0 ..1..1..0..1..0..1..0....0..0..1..0..0..1..1....0..1..0..1..1..1..1
Links
- R. H. Hardin, Table of n, a(n) for n = 1..210
Formula
Empirical: a(n) = 83*a(n-1) -710*a(n-2) +3004*a(n-3) -7952*a(n-4) +16752*a(n-5) -27360*a(n-6) +33984*a(n-7) -26368*a(n-8) for n>10
Comments