A275134 Number of 5Xn 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,0) or (-1,1) and new values introduced in order 0..2.

8, 108, 373, 2178, 12423, 71576, 412306, 2381629, 13727957, 79158451, 456572944, 2633093481, 15185124732, 87573269532, 505049273961, 2912660248825, 16797581275481, 96873339396362, 558678129749247, 3221951115220504

Offset

1,1

Comments

Row 5 of A275131.

Links

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

Formula

Empirical: a(n) = a(n-1) +16*a(n-2) +49*a(n-3) +109*a(n-4) +31*a(n-5) -508*a(n-6) +75*a(n-7) +324*a(n-8) -972*a(n-9) +260*a(n-10) for n>14

Example

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

Crossrefs

Cf. A275131.

Sequence in context: A274892 A105261 A187288 * A187190 A099762 A246498

Adjacent sequences: A275131 A275132 A275133 * A275135 A275136 A275137

Keyword

nonn

Author

R. H. Hardin, Jul 17 2016

Status

approved