A233161 Number of n X n 0..7 arrays with no element x(i,j) adjacent to itself or value 7-x(i,j) horizontally, diagonally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 4 5 and 6, 2 appearing before 3 4 and 5, and 3 appearing before 4 in row major order (unlabelled 8-colorings with no clashing color pairs).
1, 1, 96, 28672, 31457280, 133143986176, 2216615441596416, 146421031085069565952, 38534510500216304943759360, 40485591044789076510300958621696
Offset: 1
Keywords
Examples
Some solutions for n=4 ..0..1..0..2....0..1..2..1....0..1..2..1....0..1..7..1....0..1..2..6 ..3..5..3..6....5..3..7..3....5..3..0..3....2..3..5..3....5..3..0..4 ..0..6..0..2....0..6..5..6....0..6..2..1....1..7..6..7....7..6..5..1 ..4..2..3..6....2..4..7..3....5..3..0..4....4..5..3..5....5..4..7..3
Links
- R. H. Hardin, Table of n, a(n) for n = 1..16
Comments