A185521 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock singular.

31, 143, 143, 593, 1489, 593, 2553, 12361, 12361, 2553, 10847, 115979, 154561, 115979, 10847, 46303, 1058503, 2490449, 2490449, 1058503, 46303, 197329, 9856209, 35659489, 80761059, 35659489, 9856209, 197329, 841449, 91539073, 541370505

Offset: 1

Author

R. H. Hardin Jan 29 2011

Keywords

• nonn
• tabl

Comments

Table starts

.......31.........143............593..............2553................10847

......143........1489..........12361............115979..............1058503

......593.......12361.........154561...........2490449.............35659489

.....2553......115979........2490449..........80761059...........2183297449

....10847.....1058503.......35659489........2183297449..........96865190255

....46303.....9856209......541370505.......65652458491........5157904182519

...197329....91539073.....7998109489.....1894624012417......249246507105681

...841449...853020411...119752453041....56140705014995....12721664424927033

..3587359..7948563615..1781802607473..1649002255383641...630667351622299519

.15295151.74110312433.26592505725449.48754926946880491.31779395697846344999

Examples

			Some solutions for 4X3
..2..1..0....0..2..1....2..0..1....0..0..0....2..0..2....1..0..1....2..0..2
..0..0..0....0..0..0....1..0..0....0..0..0....0..0..2....0..0..1....2..0..0
..2..0..1....0..0..0....1..0..0....1..0..2....0..0..1....1..0..2....0..0..1
..1..0..0....0..0..1....1..0..0....0..0..2....1..0..0....1..0..0....0..0..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..199