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A260365
Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001111
1
208, 342, 912, 2014, 2532, 5806, 13632, 20576, 39376, 91830, 156768, 279744, 621988, 1154372, 2028560, 4261442, 8304084, 14800068, 29615732, 58935832, 107612892, 208478370, 415856628, 777318530, 1480611488, 2931957688, 5578603544
OFFSET
1,1
COMMENTS
Column 3 of A260370
LINKS
FORMULA
Empirical: a(n) = 6*a(n-3) +11*a(n-4) -3*a(n-6) -46*a(n-7) -50*a(n-8) -10*a(n-9) +29*a(n-10) +148*a(n-11) +136*a(n-12) +12*a(n-13) -113*a(n-14) -228*a(n-15) -260*a(n-16) +10*a(n-17) +203*a(n-18) +200*a(n-19) +295*a(n-20) +8*a(n-21) -104*a(n-22) -80*a(n-23) -161*a(n-24) -16*a(n-25) +12*a(n-26) +4*a(n-27) +16*a(n-28) for n>30
EXAMPLE
Some solutions for n=4
..1..0..0..1..0....1..0..0..0..1....0..0..0..1..0....1..1..0..0..0
..1..0..0..1..0....1..0..0..1..1....1..0..0..0..0....0..1..0..0..1
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..1..1....0..0..0..0..0
..0..1..0..0..1....1..0..0..1..0....1..0..0..0..0....0..0..1..0..0
..1..1..0..0..0....0..0..0..1..0....0..0..0..0..0....0..0..1..1..1
CROSSREFS
Sequence in context: A123136 A092153 A283152 * A131686 A235273 A255082
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 23 2015
STATUS
approved