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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
OFFSET
1,1
COMMENTS
Column 2 of A239424
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 17 2014
STATUS
approved