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A259997
Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101
1
641, 1819, 6157, 12620, 23680, 74850, 197804, 383548, 942638, 2727852, 6128454, 13250442, 35951522, 91093240, 199168800, 485362526, 1276770070, 2989412528, 6882229004, 17541213370, 43445183724, 100482691170, 244053647200
OFFSET
1,1
COMMENTS
Column 4 of A260001
LINKS
FORMULA
Empirical: a(n) = 3*a(n-2) +10*a(n-3) +25*a(n-4) -27*a(n-5) -99*a(n-6) -107*a(n-7) -136*a(n-8) +291*a(n-9) +668*a(n-10) +342*a(n-11) +145*a(n-12) -1029*a(n-13) -1042*a(n-14) +184*a(n-15) +1132*a(n-16) -216*a(n-17) -2049*a(n-18) -141*a(n-19) +321*a(n-20) +457*a(n-21) -4*a(n-22) +44*a(n-24) -352*a(n-25) +279*a(n-26) for n>30
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..0....0..0..0..0..0..1....0..1..0..0..0..0....0..1..1..0..0..0
..0..0..0..1..0..0....0..0..0..0..0..0....0..1..0..0..1..0....0..0..0..0..0..0
..1..0..0..1..0..0....0..1..1..0..0..0....0..0..0..0..1..1....0..0..0..0..0..1
..0..0..0..0..0..0....0..0..0..0..0..1....0..0..0..0..0..0....0..0..1..0..0..1
..0..0..0..0..0..0....0..0..0..0..0..1....0..1..0..0..0..0....0..0..1..0..0..0
..1..0..0..1..0..1....0..1..1..0..0..0....0..1..0..0..1..0....0..0..0..0..0..1
CROSSREFS
Sequence in context: A105130 A117129 A106488 * A256806 A206164 A206378
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2015
STATUS
approved