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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, 1, 96, 28672, 31457280, 133143986176, 2216615441596416, 146421031085069565952, 38534510500216304943759360, 40485591044789076510300958621696 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A233168

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

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

CROSSREFS

Sequence in context: A203489 A208794 A276099 * A269090 A232522 A296061

Adjacent sequences:  A233158 A233159 A233160 * A233162 A233163 A233164

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 05 2013

STATUS

approved

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)