A234118 Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.

3127, 116801, 4279065, 157630963, 5807422543, 214027901025, 7888454356625, 290756314787875, 10716964158533127, 395017615132720993, 14560017639995412841, 536670372954048895219, 19781236893820566186079

Offset: 1

Author

R. H. Hardin, Dec 19 2013

Keywords

• nonn

Comments

Column 4 of A234122

Examples

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

Links

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

Formula

Empirical: a(n) = 50*a(n-1) -427*a(n-2) -2748*a(n-3) +22158*a(n-4) +50476*a(n-5) -220478*a(n-6) -236864*a(n-7) +237555*a(n-8) +152850*a(n-9) -74775*a(n-10) -7956*a(n-11)