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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 Table of n, a(n) for n=1..34. 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 Adjacent sequences: A213987 A213988 A213989 * A213991 A213992 A213993 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.)