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A259767 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101 1
104, 167, 256, 385, 612, 1108, 1708, 2700, 4660, 7378, 11350, 19232, 31280, 48032, 80218, 131336, 202926, 335260, 550228, 857598, 1403502, 2304624, 3618252, 5883582, 9653232, 15248198, 24687220, 40439420, 64203790, 103643474, 169453708 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A259770
LINKS
FORMULA
Empirical: a(n) = 3*a(n-3) +3*a(n-6) +4*a(n-7) -2*a(n-9) +2*a(n-11) -8*a(n-13) +6*a(n-14) for n>17
EXAMPLE
Some solutions for n=4
..0..0..1..0..0....0..1..0..0..0....0..0..1..0..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..1....0..0..0..0..0....0..0..0..1..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..1..0..0
..0..0..1..0..0....0..1..0..0..0....1..0..0..1..0....0..0..0..0..0
..0..1..0..0..0....1..0..0..0..1....0..0..0..0..1....0..0..0..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..1..0..0
CROSSREFS
Sequence in context: A298505 A253693 A168528 * A234261 A260288 A044336
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 04 2015
STATUS
approved

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Last modified July 19 22:34 EDT 2024. Contains 374441 sequences. (Running on oeis4.)