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A259946 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00000101 1
60, 170, 549, 1507, 4128, 11933, 34337, 97374, 277073, 791655, 2258776, 6438153, 18360749, 52375446, 149376869, 426006811, 1215002568, 3465304429, 9883190601, 28187259534, 80391677785, 229281523567, 653922541496, 1865020964353 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A259952

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 2*a(n-1) +2*a(n-2) +a(n-3) +6*a(n-4) -14*a(n-5) -4*a(n-6) +2*a(n-7) -4*a(n-8) +4*a(n-9) for n>10

EXAMPLE

Some solutions for n=4

..0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0....1..0..0..0

..1..0..0..0....0..0..0..0....0..0..0..1....1..0..0..0....0..0..0..1

..0..0..0..0....1..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..0....0..0..0..1

..1..0..0..1....0..0..0..1....0..0..1..0....0..0..0..0....0..0..0..0

..0..0..0..0....1..0..0..0....0..0..0..1....0..0..1..0....1..0..0..1

CROSSREFS

Cf. A259952

Sequence in context: A216480 A257146 A291549 * A249911 A292223 A112827

Adjacent sequences:  A259943 A259944 A259945 * A259947 A259948 A259949

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 10 2015

STATUS

approved

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Last modified October 22 23:18 EDT 2018. Contains 316518 sequences. (Running on oeis4.)