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A260976 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101 1
483, 481, 732, 1513, 2714, 5506, 9728, 18578, 33658, 66832, 122644, 237212, 431888, 836918, 1545484, 2982194, 5509198, 10561098, 19597590, 37523150, 69861252, 133304344, 248584050, 473406314, 884926304, 1682544698, 3149522270 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A260980
LINKS
FORMULA
Empirical: a(n) = 2*a(n-2) +4*a(n-4) +5*a(n-5) -5*a(n-7) -2*a(n-8) -12*a(n-9) +7*a(n-10) +11*a(n-11) +2*a(n-12) +a(n-13) -4*a(n-15) -11*a(n-16) -8*a(n-17) -a(n-18) -4*a(n-19) for n>26
EXAMPLE
Some solutions for n=4
..0..0..0..1..0..1....0..0..0..0..1..0....0..1..0..0..0..1....1..0..0..0..0..1
..0..0..1..0..0..0....0..0..1..0..0..1....0..0..0..0..1..0....0..1..0..0..1..0
..1..0..0..0..1..0....1..0..0..1..0..0....0..0..1..0..0..0....0..0..0..0..0..0
..0..0..0..1..0..0....0..1..0..0..0..0....0..0..0..1..0..0....1..0..0..0..0..1
..0..0..0..0..0..1....0..0..0..0..1..0....0..1..0..0..0..0....0..0..1..0..0..0
..1..0..0..0..1..0....1..0..0..0..0..1....1..0..0..0..1..0....0..1..0..0..1..0
CROSSREFS
Sequence in context: A231395 A263291 A121734 * A281047 A158330 A288082
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 06 2015
STATUS
approved

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Last modified October 2 02:58 EDT 2023. Contains 365831 sequences. (Running on oeis4.)