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%I #8 Nov 24 2021 08:43:17
%S 2,2,11,2,24,172,3,36,1003,6327,3,72,2546,120133,474286,3,92,8168,
%T 604639,35799856,67147431,3,126,14030,3510112,421195466,24651985100,
%U 17080038508,3,148,28328,9131098,5018010431,801373175814
%N T(n,k)=Number of n X n 0..k matrices whose square is also a 0..k matrix
%e Some solutions for n=3 k=4
%e ..1..0..2....0..4..1....2..0..0....2..2..0....0..4..4....0..3..3....0..3..2
%e ..0..2..0....0..0..0....0..0..0....0..0..2....1..0..0....1..0..0....0..1..0
%e ..0..0..1....0..1..0....0..0..2....0..0..0....0..0..0....0..0..0....0..0..0
%e Table starts
%e ...........2...........2............2..........3.......3.....3...3.3
%e ..........11..........24...........36.........72......92...126.148
%e .........172........1003.........2546.......8168...14030.28328
%e ........6327......120133.......604639....3510112.9131098
%e ......474286....35799856....421195466.5018010431
%e ....67147431.24651985100.801373175814
%e .17080038508
%Y Column 1 is A121231
%K nonn,tabl,more
%O 1,1
%A _R. H. Hardin_, Jun 30 2012
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