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 A183505 Number of nX3 0..3 arrays with no element equal to the sum mod 4 of its horizontal and vertical neighbors 1
 27, 776, 19683, 531441, 14369472, 387420489, 10460353203, 282432195144, 7625597484987, 205891132094649, 5559061744716480, 150094635296999121, 4052555153018976267, 109418989288418720136, 2954312706550833698643 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A183508 LINKS R. H. Hardin, Table of n, a(n) for n = 1..180 FORMULA Empirical: a(n)=27*a(n-1)+63909*a(n-6)-1725543*a(n-7)-274577850*a(n-12)+7413601950*a(n-13)-739973133990*a(n-18)+19979274617730*a(n-19)+454993983270891*a(n-24)-12284837548314057*a(n-25)+150094635296999121*a(n-30)-4052555153018976267*a(n-31) EXAMPLE Some solutions for 5X3 ..0..2..2....0..0..0....0..0..0....0..0..0....2..0..0....2..2..2....0..0..2 ..0..2..2....2..2..2....3..2..2....3..2..2....0..0..2....2..0..2....1..0..0 ..1..1..3....2..1..3....2..0..3....2..2..3....0..3..1....2..0..3....2..2..1 ..3..1..2....0..0..2....1..0..3....0..0..0....0..0..2....1..0..2....2..1..2 ..2..1..1....3..2..2....2..2..2....3..0..3....2..0..0....0..2..1....1..2..2 CROSSREFS Sequence in context: A158645 A232951 A138979 * A218717 A159234 A120715 Adjacent sequences:  A183502 A183503 A183504 * A183506 A183507 A183508 KEYWORD nonn AUTHOR R. H. Hardin Jan 05 2011 STATUS approved

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Last modified March 29 14:37 EDT 2020. Contains 333107 sequences. (Running on oeis4.)