A185518 Number of (n+1)X7 0..2 arrays with every 2X2 subblock singular.

46303, 9856209, 541370505, 65652458491, 5157904182519, 525819969687473, 46861672135881249, 4536327635584899147, 421714260065729709743, 40230435280135273840049, 3792362066556802880530649

Offset: 1

Author

R. H. Hardin Jan 29 2011

Keywords

• nonn

Comments

Column 6 of A185521

Examples

			Some solutions for 3X7
..0..0..0..0..0..0..2....0..0..2..1..0..0..1....0..0..2..2..0..1..0
..0..2..0..1..2..0..2....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..1..2..0..2....0..0..0..0..0..1..0....0..0..1..2..1..1..0
		

Links

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