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A326165
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T(n,k) = Number of n X k 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
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7
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1, 2, 2, 3, 3, 3, 5, 6, 6, 5, 8, 11, 9, 11, 8, 13, 22, 25, 25, 22, 13, 21, 46, 60, 85, 60, 46, 21, 34, 91, 160, 261, 261, 160, 91, 34, 55, 182, 396, 838, 1136, 838, 396, 182, 55, 89, 371, 996, 2644, 5555, 5555, 2644, 996, 371, 89, 144, 746, 2480, 8646, 27902, 39808, 27902
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OFFSET
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1,2
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COMMENTS
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Table starts
..1...2....3.....5......8.......13........21..........34...........55
..2...3....6....11.....22.......46........91.........182..........371
..3...6....9....25.....60......160.......396.........996.........2480
..5..11...25....85....261......838......2644........8646........28076
..8..22...60...261...1136.....5555.....27902......142396.......715457
.13..46..160...838...5555....39808....307759.....2396312.....18554951
.21..91..396..2644..27902...307759...3984553....50108120....631752599
.34.182..996..8646.142396..2396312..50108120..1000921717..20284433349
.55.371.2480.28076.715457.18554951.631752599.20284433349.666253766253
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LINKS
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FORMULA
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Empirical for column k:
k=1: a(n) = a(n-1) +a(n-2)
k=2: a(n) = a(n-1) +4*a(n-3) +a(n-5) -a(n-6)
k=3: [order 28] for n>30
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EXAMPLE
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Some solutions for n=5 k=4
..0..0..1..1. .0..0..1..1. .0..0..0..0. .0..0..1..1. .0..0..0..0
..0..0..0..1. .0..0..0..1. .0..0..0..0. .0..0..0..1. .0..0..0..0
..1..1..1..1. .0..0..0..0. .0..0..0..1. .1..1..0..0. .0..0..1..0
..0..1..1..0. .0..0..0..0. .0..1..1..0. .0..1..1..1. .0..0..1..1
..1..1..1..1. .1..0..0..0. .0..0..1..0. .0..0..1..1. .1..0..1..1
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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