A275180 Number of n X 5 0..2 arrays with no element equal to any value at offset (-2,-1) (-1,0) or (-1,1) and new values introduced in order 0..2.

41, 256, 317, 482, 1465, 4603, 14643, 46799, 149772, 479722, 1538582, 4942028, 15891866, 51127466, 164489244, 529125544, 1701961499, 5474696445, 17611978722, 56660560468, 182287542046, 586443173365, 1886643497675, 6069534405199

Offset: 1

Author

R. H. Hardin, Jul 19 2016

Keywords

• nonn

Comments

Column 5 of A275183.

Examples

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

Links

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

Crossrefs

Cf. A275183.

Formula

Empirical: a(n) = 16*a(n-1) -120*a(n-2) +561*a(n-3) -1820*a(n-4) +4313*a(n-5) -7688*a(n-6) +10549*a(n-7) -11473*a(n-8) +10333*a(n-9) -8076*a(n-10) +5538*a(n-11) -3198*a(n-12) +1466*a(n-13) -508*a(n-14) +120*a(n-15) -12*a(n-16) for n > 21.