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A260975 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101 1
204, 239, 372, 732, 1288, 2576, 4688, 8760, 15964, 30062, 55496, 105078, 192148, 361876, 663360, 1248880, 2301984, 4312846, 7974836, 14889918, 27581092, 51446550, 95444100, 177936588, 330029564, 614889132, 1141497232, 2126263226 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260980

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-4) +6*a(n-5) +10*a(n-7) +5*a(n-8) -24*a(n-9) -4*a(n-10) -26*a(n-11) +39*a(n-12) -a(n-14) for n>18

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260980

Sequence in context: A198913 A224983 A138605 * A271643 A108877 A163393

Adjacent sequences:  A260972 A260973 A260974 * A260976 A260977 A260978

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2015

STATUS

approved

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Last modified April 20 22:22 EDT 2019. Contains 322310 sequences. (Running on oeis4.)