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 A213985 Number of n X n 0..3 matrices whose square is also a 0..3 matrix 0
 2, 36, 2546, 604639, 421195466, 801373175814 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A213990 LINKS Table of n, a(n) for n=1..6. EXAMPLE Some solutions for n=3 ..1..0..0....0..2..1....1..2..1....0..3..0....0..0..2....0..1..3....0..1..0 ..0..0..3....0..0..0....0..0..0....0..1..1....0..1..1....0..0..1....0..1..0 ..0..0..1....0..0..1....1..0..0....0..2..0....0..1..1....0..0..0....0..1..1 CROSSREFS Sequence in context: A303503 A178949 A200571 * A203021 A319507 A001070 Adjacent sequences: A213982 A213983 A213984 * A213986 A213987 A213988 KEYWORD nonn AUTHOR R. H. Hardin Jun 30 2012 STATUS approved

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Last modified September 14 21:48 EDT 2024. Contains 375929 sequences. (Running on oeis4.)