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A259718 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000011 1
140, 228, 568, 1064, 1244, 2858, 6092, 8638, 15640, 34858, 57256, 94682, 200008, 364268, 598252, 1171728, 2247716, 3811864, 7036700, 13649110, 24088156, 43117388, 82546000, 150335226, 267211096, 500979428, 928570300, 1661448778 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A259723

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-3) +6*a(n-4) -9*a(n-6) -16*a(n-7) -12*a(n-8) +4*a(n-9) +7*a(n-10) +10*a(n-11) +14*a(n-12) -3*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A259723

Sequence in context: A256085 A131492 A276026 * A090945 A140798 A249554

Adjacent sequences:  A259715 A259716 A259717 * A259719 A259720 A259721

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 03 2015

STATUS

approved

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Last modified February 20 20:12 EST 2018. Contains 299385 sequences. (Running on oeis4.)