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A298066
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Number of nX4 0..1 arrays with every element equal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.
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1
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0, 5, 13, 59, 346, 2197, 13350, 84657, 529728, 3332184, 20964122, 131877463, 829756630, 5220895754, 32849496926, 206690481993, 1300503303978, 8182815008750, 51486600462026, 323955743728628, 2038342606416797
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OFFSET
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1,2
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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) +21*a(n-2) +20*a(n-3) -79*a(n-4) -297*a(n-5) -515*a(n-6) -65*a(n-7) +3135*a(n-8) +4790*a(n-9) -9467*a(n-10) -19768*a(n-11) +22520*a(n-12) +41611*a(n-13) -9470*a(n-14) +67882*a(n-15) +127389*a(n-16) -110968*a(n-17) -192960*a(n-18) -459542*a(n-19) -972861*a(n-20) -631438*a(n-21) -403464*a(n-22) +82853*a(n-23) +2308341*a(n-24) +3808053*a(n-25) +4299720*a(n-26) +1368128*a(n-27) +242434*a(n-28) +2969861*a(n-29) -4860102*a(n-30) -2751493*a(n-31) +3510365*a(n-32) -5993208*a(n-33) -2885203*a(n-34) -4604290*a(n-35) -5951332*a(n-36) +2187218*a(n-37) +2171423*a(n-38) +121390*a(n-39) -4212722*a(n-40) -7637013*a(n-41) -4237987*a(n-42) +2916291*a(n-43) -211361*a(n-44) -1418957*a(n-45) -2529996*a(n-46) -99823*a(n-47) +1187281*a(n-48) -239005*a(n-49) +159474*a(n-50) -230785*a(n-51) +137096*a(n-52) -3973*a(n-53) -2523*a(n-54) +5307*a(n-55) +3994*a(n-56) -1228*a(n-57) -1142*a(n-58) +815*a(n-59) +87*a(n-60) -12*a(n-61) +12*a(n-62) for n>63
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EXAMPLE
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Some solutions for n=7
..0..0..0..1. .0..0..1..1. .0..0..1..1. .0..0..1..1. .0..0..0..0
..1..0..1..1. .0..1..0..1. .0..1..0..1. .0..0..0..1. .0..1..0..1
..1..1..0..0. .1..0..1..1. .1..0..1..1. .1..0..0..1. .1..0..1..1
..0..0..1..0. .1..1..1..1. .1..0..0..1. .1..1..1..1. .1..0..1..0
..0..1..1..0. .0..0..0..0. .1..0..0..1. .1..0..0..1. .0..1..0..0
..1..1..0..0. .0..1..1..0. .0..1..1..0. .0..0..0..1. .0..0..1..1
..1..1..1..0. .1..1..0..0. .0..0..0..0. .0..0..1..1. .0..0..0..1
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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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