A233261 Number of 6Xn 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabeled 6-colorings with no clashing color pairs).

1248, 524800, 509640704, 495341010944, 507618560835584, 525597937107992576, 548491734506604068864, 573981067569027897884672, 601558225688924228943872000, 630830989777808716060719841280

Offset

1,1

Comments

Row 6 of A233256

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 1984*a(n-1) -1282048*a(n-2) +346292224*a(n-3) -27028094976*a(n-4) -6584184864768*a(n-5) +1907721393668096*a(n-6) -214149680718675968*a(n-7) +12624715655426342912*a(n-8) -384499321786383466496*a(n-9) +4759259971017064316928*a(n-10) for n>16

Example

Some solutions for n=2
..0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1....0..1
..0..1....0..2....0..2....0..2....0..2....0..2....0..1....0..2....0..2....0..2
..2..4....4..5....1..0....1..5....5..3....1..5....5..1....0..1....4..5....4..0
..2..0....3..1....3..0....1..2....0..1....1..3....2..4....3..0....2..5....3..5
..1..0....3..0....4..0....0..2....3..0....5..2....3..1....4..5....4..2....4..5
..1..3....4..5....4..3....4..2....1..3....4..0....2..4....1..0....1..0....1..5

Crossrefs

Sequence in context: A266037 A233179 A224435 * A233201 A233244 A233222

Adjacent sequences: A233258 A233259 A233260 * A233262 A233263 A233264

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved