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 A239420 Number of nX2 0..3 arrays with no element equal to the sum of elements to its left or the sum of elements above it or the sum of the elements diagonally to its northwest, modulo 4 1
 6, 18, 80, 320, 1244, 4990, 19560, 77220, 304224, 1197958, 4717332, 18575316, 73129198, 287925250, 1133540066, 4462693994, 17569294396, 69168560346, 272309851366, 1072054712756, 4220563726184, 16615895170312, 65414941885872 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A239424 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 2*a(n-1) +11*a(n-2) -a(n-3) -39*a(n-4) -40*a(n-5) +3*a(n-6) +13*a(n-7) +64*a(n-8) +162*a(n-9) -220*a(n-10) +122*a(n-11) -38*a(n-12) -82*a(n-13) +60*a(n-14) for n>15 EXAMPLE Some solutions for n=5 ..1..2....2..1....1..3....1..2....1..2....2..3....3..1....1..3....1..3....2..3 ..3..0....1..0....3..0....2..0....2..3....1..0....1..0....3..2....3..0....1..0 ..3..1....1..2....3..0....1..0....2..0....1..0....2..0....3..2....2..0....1..0 ..2..0....3..0....1..2....1..0....3..0....2..0....1..0....1..2....3..1....3..0 ..2..0....1..2....2..0....2..3....1..2....3..1....1..0....1..2....3..2....2..1 CROSSREFS Sequence in context: A218080 A277609 A188119 * A219590 A260664 A279260 Adjacent sequences:  A239417 A239418 A239419 * A239421 A239422 A239423 KEYWORD nonn AUTHOR R. H. Hardin, Mar 17 2014 STATUS approved

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Last modified April 9 12:51 EDT 2020. Contains 333352 sequences. (Running on oeis4.)