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A301968
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Number of 6Xn 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.
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1
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32, 233, 252, 441, 874, 2544, 7795, 22456, 66659, 203926, 621905, 1891815, 5775564, 17661198, 53992136, 165070762, 504836902, 1544110348, 4722844581, 14445769443, 44186654928, 135159112990, 413428628386, 1264613037181, 3868263645434
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OFFSET
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1,1
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COMMENTS
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Row 6 of A301964.
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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) = 4*a(n-1) -5*a(n-2) +15*a(n-3) -27*a(n-4) +16*a(n-5) -59*a(n-6) +50*a(n-7) -13*a(n-8) +119*a(n-9) +11*a(n-10) +12*a(n-11) -125*a(n-12) -138*a(n-13) -13*a(n-14) +57*a(n-15) +150*a(n-16) +52*a(n-17) -27*a(n-18) -87*a(n-19) -36*a(n-20) +14*a(n-21) +34*a(n-22) +11*a(n-23) -8*a(n-24) -7*a(n-25) -a(n-26) +2*a(n-27) for n>32
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EXAMPLE
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Some solutions for n=5
..0..0..1..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..1..0..0..1..0. .0..1..1..1..0. .0..1..1..1..0. .0..0..0..1..0
..1..1..0..0..0. .0..1..0..1..0. .0..1..0..1..1. .0..1..1..1..0
..0..1..0..1..0. .0..0..0..1..0. .0..1..0..0..1. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..0..0. .0..1..1..0..1. .0..0..0..1..0
..0..1..0..1..0. .0..1..0..1..1. .0..0..1..0..1. .0..1..0..1..0
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CROSSREFS
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Cf. A301964.
Sequence in context: A269585 A199913 A301795 * A208641 A301889 A302085
Adjacent sequences: A301965 A301966 A301967 * A301969 A301970 A301971
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Mar 29 2018
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STATUS
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approved
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