A187421 Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants.

609, 6512, 46764, 602024, 5254072, 56472058, 533853394, 5585054046, 54998694426, 562340568708, 5598043072500, 56738877828678, 568753193822092, 5743694780294918, 57708886492197048, 581740972471740850

Offset: 1

Author

R. H. Hardin Mar 09 2011

Keywords

• nonn

Comments

Column 3 of A187425

Examples

			Some solutions for 3X4
..2..1..0..1....0..0..0..1....2..2..0..2....0..2..2..2....1..0..2..0
..2..2..2..1....0..0..1..1....1..2..0..0....0..1..1..2....2..1..2..1
..0..1..2..0....2..0..2..1....0..2..0..0....1..1..0..2....1..1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200