A274752 Number of 5Xn 0..2 arrays with no element equal to any value at offset (-1,-2) (0,-1) or (-1,0) and new values introduced in order 0..2.

8, 81, 610, 4967, 40242, 327123, 2661918, 21656459, 176259458, 1434313078, 11673115263, 94995850464, 773101634059, 6291606309132, 51202379223709, 416693699123591, 3391131540449104, 27597636527429286, 224594629125220765

Offset: 1

Author

R. H. Hardin, Jul 04 2016

Keywords

• nonn

Comments

Row 5 of A274749.

Examples

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

Links

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

Crossrefs

Cf. A274749.

Formula

Empirical: a(n) = 2*a(n-1) +55*a(n-2) +38*a(n-3) -614*a(n-4) -600*a(n-5) +2769*a(n-6) +2140*a(n-7) -6482*a(n-8) -2606*a(n-9) +7803*a(n-10) +678*a(n-11) -4266*a(n-12) +304*a(n-13) +924*a(n-14) -72*a(n-15) -72*a(n-16) for n>17