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 A213993 Number of 4X4 0..n matrices whose square is also a 0..n matrix 1
 6327, 120133, 604639, 3510112, 9131098, 29365738, 56599992, 127113628, 255379242, 499365458, 784233528, 1531915046, 2261261860, 3473439982, 5267581848, 8552671195, 11581885709, 17881607889, 23603815011, 34808081571 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A213990 LINKS R. H. Hardin, Table of n, a(n) for n = 1..40 EXAMPLE Some solutions for n=3 ..0..2..1..0....1..0..2..3....0..1..1..2....0..0..1..0....1..0..0..0 ..0..0..0..0....0..1..1..0....0..1..0..0....0..0..1..2....0..0..1..2 ..0..3..0..0....0..0..0..0....0..0..0..0....1..0..0..0....0..0..1..3 ..1..2..0..0....0..0..0..0....1..1..0..0....1..0..0..0....1..0..0..0 CROSSREFS Sequence in context: A054560 A069428 A251024 * A252268 A292715 A296777 Adjacent sequences: A213990 A213991 A213992 * A213994 A213995 A213996 KEYWORD nonn AUTHOR R. H. Hardin Jun 30 2012 STATUS approved

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Last modified July 19 10:32 EDT 2024. Contains 374392 sequences. (Running on oeis4.)