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A183458 Number of (n+4)X5 binary arrays with every 1 having exactly three king-move neighbors equal to 1 but with no 2X2 blocks of 1s 1
1, 1, 2, 3, 4, 21, 40, 60, 344, 706, 1115, 5961, 12955, 21430, 105338, 240405, 415187, 1882817, 4477153, 8046028, 33915664, 83437560, 155547810, 614501063, 1554456963, 2997410782, 11186285623, 28942766933, 57570735736, 204441596636 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 1 of A183465

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=a(n-1)+43*a(n-3)-41*a(n-4)-613*a(n-6)+571*a(n-7)-15*a(n-8)+3083*a(n-9)-2902*a(n-10)+333*a(n-11)-2977*a(n-12)+2546*a(n-13)-1433*a(n-14)+405*a(n-15)+1215*a(n-16)-137*a(n-17)-12*a(n-18)-168*a(n-19)-84*a(n-20)

EXAMPLE

All solutions for 7X5

..0..0..1..0..0....0..0..0..0..0

..0..1..1..1..0....0..0..0..0..0

..1..0..0..0..1....0..0..0..0..0

..1..1..0..1..1....0..0..0..0..0

..1..0..0..0..1....0..0..0..0..0

..0..1..1..1..0....0..0..0..0..0

..0..0..1..0..0....0..0..0..0..0

CROSSREFS

Sequence in context: A176234 A308891 A058780 * A109787 A109302 A081480

Adjacent sequences:  A183455 A183456 A183457 * A183459 A183460 A183461

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 05 2011

STATUS

approved

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Last modified October 21 15:46 EDT 2021. Contains 348155 sequences. (Running on oeis4.)