A274898 Number of 6Xn 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-1) or (-2,0) and new values introduced in order 0..2.

24, 50, 192, 753, 3017, 12217, 49697, 202749, 828828, 3391310, 13878192, 56789705, 232384474, 950977585, 3891812709, 15927107508, 65180736176, 266747574843, 1091648042865, 4467513170474, 18283077346563, 74822562153129

Offset: 1

Author

R. H. Hardin, Jul 10 2016

Keywords

• nonn

Comments

Row 6 of A274895.

Examples

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

Links

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

Crossrefs

Cf. A274895.

Formula

Empirical: a(n) = 13*a(n-1) -77*a(n-2) +286*a(n-3) -736*a(n-4) +1351*a(n-5) -1787*a(n-6) +1716*a(n-7) -1217*a(n-8) +652*a(n-9) -265*a(n-10) +78*a(n-11) -14*a(n-12) +a(n-13) for n>14