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A240418
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Number of nX2 0..3 arrays with no element equal to two plus the sum of elements to its left or two plus the sum of elements above it or two plus the sum of the elements diagonally to its northwest, modulo 4
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1
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7, 35, 147, 553, 2045, 7439, 27099, 98193, 356367, 1290555, 4678201, 16941465, 61383669, 222305205, 805315687, 2916643869, 10564820487, 38264178015, 138597036507, 501986131233, 1818215357263, 6585476407465, 23852672493721
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OFFSET
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1,1
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COMMENTS
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Column 2 of A240422
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 5*a(n-1) +4*a(n-2) -46*a(n-3) +28*a(n-4) +101*a(n-5) -71*a(n-6) -93*a(n-7) -4*a(n-8) +94*a(n-9) +65*a(n-10) -115*a(n-11) -13*a(n-12) +70*a(n-13) -8*a(n-14) -16*a(n-15)
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EXAMPLE
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Some solutions for n=4
..0..0....0..3....1..1....0..1....0..3....0..0....3..0....0..0....0..3....0..1
..3..3....3..3....0..0....1..1....0..0....0..3....3..3....0..1....3..0....0..1
..0..3....3..3....1..1....1..1....1..0....1..0....3..2....3..0....3..3....1..1
..0..3....1..0....1..1....3..0....1..0....1..0....1..0....3..0....1..2....0..0
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CROSSREFS
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Sequence in context: A023006 A001875 A169794 * A211843 A121163 A223621
Adjacent sequences: A240415 A240416 A240417 * A240419 A240420 A240421
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Apr 04 2014
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STATUS
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approved
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