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A183446
Number of nX5 binary arrays with every 1 having exactly two king-move neighbors equal to 1
1
1, 33, 107, 283, 2054, 9208, 34867, 176949, 833001, 3619285, 16979210, 79536106, 362125386, 1678147584, 7816357207, 36107427015, 167380756056, 778109691292, 3610178963149, 16759752441151, 77893373268254, 361906632299828
OFFSET
1,2
COMMENTS
Column 5 of A183450
LINKS
FORMULA
Empirical: a(n)=6*a(n-1)-4*a(n-2)+26*a(n-3)-181*a(n-4)-17*a(n-5)+101*a(n-6)+1148*a(n-7)-826*a(n-8)+575*a(n-9)-429*a(n-10)-160*a(n-11)-83*a(n-12)-913*a(n-13)-799*a(n-14)+405*a(n-15)+185*a(n-16)+74*a(n-17)-8*a(n-18)-33*a(n-19)+6*a(n-20)
EXAMPLE
Some solutions for 7X5
..0..1..1..0..0....0..0..0..0..0....0..0..0..1..1....0..0..0..0..0
..1..0..0..1..0....0..1..0..0..0....1..1..0..1..0....0..0..0..0..0
..0..1..1..0..0....1..1..0..1..0....1..0..0..0..0....0..1..0..0..0
..0..0..0..0..0....0..0..0..1..1....0..0..0..0..0....1..1..0..0..0
..1..0..0..0..0....1..1..0..0..0....0..0..0..0..0....0..0..0..0..0
..1..1..0..1..1....0..1..0..0..1....1..0..0..1..0....0..1..0..0..0
..0..0..0..1..0....0..0..0..1..1....1..1..0..1..1....0..1..1..0..0
CROSSREFS
Sequence in context: A370481 A045613 A033574 * A296125 A297429 A039520
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2011
STATUS
approved