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A304601
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Number of nX5 0..1 arrays with every element unequal to 0, 1, 2, 5 or 6 king-move adjacent elements, with upper left element zero.
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1
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16, 22, 53, 179, 560, 1726, 5205, 15474, 46577, 140882, 425811, 1284730, 3876203, 11701804, 35329457, 106648194, 321916587, 971745234, 2933418071, 8855071730, 26730426635, 80690036458, 243576592865, 735277676028, 2219559525935
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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Empirical: a(n) = 3*a(n-1) +3*a(n-2) -11*a(n-3) +10*a(n-4) +4*a(n-5) -67*a(n-6) +52*a(n-7) +80*a(n-8) -134*a(n-9) +50*a(n-10) +85*a(n-11) -134*a(n-12) +124*a(n-13) +62*a(n-14) -158*a(n-15) +85*a(n-16) -26*a(n-17) -85*a(n-18) +50*a(n-19) -19*a(n-20) +32*a(n-21) -22*a(n-22) +5*a(n-23) +43*a(n-24) -59*a(n-25) +33*a(n-26) +12*a(n-27) -34*a(n-28) +23*a(n-29) -4*a(n-30) -5*a(n-31) +4*a(n-32) -a(n-33) for n>39
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EXAMPLE
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Some solutions for n=5
..0..1..0..0..0. .0..0..0..0..0. .0..0..0..1..0. .0..0..0..0..0
..0..0..0..0..0. .1..1..0..0..0. .0..0..0..0..0. .0..0..1..1..0
..1..0..0..0..1. .1..1..0..0..0. .0..0..0..0..0. .0..1..0..1..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..1..0..0
..0..1..0..1..0. .0..0..0..0..0. .0..1..0..0..0. .1..1..0..0..0
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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