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A213990 T(n,k)=Number of n X n 0..k matrices whose square is also a 0..k matrix 10
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
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
Sequence in context: A037234 A141651 A359425 * A275429 A222878 A090525
KEYWORD
nonn,tabl,more
AUTHOR
R. H. Hardin, Jun 30 2012
STATUS
approved

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Last modified July 17 05:50 EDT 2024. Contains 374360 sequences. (Running on oeis4.)