A213990 T(n,k)=Number of n X n 0..k matrices whose square is also a 0..k matrix.

2, 2, 11, 2, 24, 172, 3, 36, 1003, 6327, 3, 72, 2546, 120133, 474286, 3, 92, 8168, 604639, 35799856, 67147431, 3, 126, 14030, 3510112, 421195466, 24651985100, 17080038508, 3, 148, 28328, 9131098, 5018010431, 801373175814

Offset: 1

Author

R. H. Hardin, Jun 30 2012

Keywords

• nonn
• tabl
• more

Examples

			Some solutions for n=3 k=4
..1..0..2....0..4..1....2..0..0....2..2..0....0..4..4....0..3..3....0..3..2
..0..2..0....0..0..0....0..0..0....0..0..2....1..0..0....1..0..0....0..1..0
..0..0..1....0..1..0....0..0..2....0..0..0....0..0..0....0..0..0....0..0..0
Table starts
...........2...........2............2..........3.......3.....3...3.3
..........11..........24...........36.........72......92...126.148
.........172........1003.........2546.......8168...14030.28328
........6327......120133.......604639....3510112.9131098
......474286....35799856....421195466.5018010431
....67147431.24651985100.801373175814
.17080038508
		

Crossrefs

Column 1 is A121231