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A259741
Number of (n+2) X (7+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00010101 or 01010101.
1
265, 760, 3480, 10570, 35036, 110886, 416107, 1244504, 4489732, 13887332, 50550272, 153892178, 560073447, 1715846404, 6236321603, 19065593974, 69365627376, 212174735776, 771528061749, 2359839029908, 8583078813482
OFFSET
1,1
COMMENTS
Column 7 of A259742.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-2) +72*a(n-4) +126*a(n-6) -506*a(n-8) -177*a(n-10) +2157*a(n-12) -663*a(n-14) -6554*a(n-16) +8949*a(n-18) -1807*a(n-20) -4122*a(n-22) +1182*a(n-24) +500*a(n-26) +261*a(n-28) +111*a(n-30) -10*a(n-32) +10*a(n-34) for n>37.
EXAMPLE
Some solutions for n=4
..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1
..0..0..0..1..0..1..0..1..0....0..0..0..1..0..1..0..1..0
..1..0..1..0..1..0..1..0..1....1..0..1..0..1..0..1..0..1
..0..1..0..1..0..1..0..0..0....0..1..0..1..0..1..0..0..0
..1..0..0..0..1..0..1..0..1....0..0..1..0..0..0..1..0..1
..0..1..0..1..0..1..0..1..0....0..1..0..1..0..1..0..1..0
CROSSREFS
Cf. A259742.
Sequence in context: A255085 A146335 A211714 * A202416 A202471 A202464
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 04 2015
STATUS
approved