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A239859
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Number of 2Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4
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1
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2, 3, 9, 12, 29, 63, 100, 215, 468, 785, 1654, 3515, 6048, 12676, 26381, 46460, 96810, 198286, 355994, 737992, 1493159, 2724777, 5619409, 11263131, 20836948, 42752798, 85081916, 159218104, 325067366, 643478067, 1215731399, 2470549558, 4871466920
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OFFSET
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1,1
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COMMENTS
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Row 2 of A239858
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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) = a(n-1) +a(n-2) +7*a(n-3) -8*a(n-4) -7*a(n-5) +9*a(n-7) +10*a(n-8) -24*a(n-9) +5*a(n-10) +29*a(n-11) -18*a(n-12) -10*a(n-13) -10*a(n-14) +16*a(n-15) +12*a(n-16) -12*a(n-17) for n>21
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EXAMPLE
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Some solutions for n=4
..3..2..3..2....2..3..3..2....2..3..3..3....3..2..2..2....3..2..3..3
..2..1..1..3....3..1..1..3....3..2..2..2....2..1..0..0....2..3..2..2
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CROSSREFS
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Sequence in context: A067719 A057017 A330242 * A047162 A155929 A175206
Adjacent sequences: A239856 A239857 A239858 * A239860 A239861 A239862
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 28 2014
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STATUS
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approved
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