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A260011 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010101 or 01010101 1
209, 578, 2492, 8450, 25600, 84050, 292422, 985608, 3251280, 10857800, 36602762, 122774450, 410260884, 1373718528, 4607045940, 15437704898, 51696499120, 173176718162, 580275938368, 1944096211250, 6512576848570, 21817926896768 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A260015

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +9*a(n-3) +27*a(n-4) -13*a(n-5) -a(n-6) -54*a(n-7) -129*a(n-8) +13*a(n-9) -2*a(n-10) +48*a(n-11) +108*a(n-12) -4*a(n-13) -8*a(n-15) -16*a(n-16) for n>17

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260015

Sequence in context: A250780 A305173 A316761 * A203048 A203041 A293981

Adjacent sequences: A260008 A260009 A260010 * A260012 A260013 A260014

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 13 2015

STATUS

approved

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Last modified March 30 09:39 EDT 2023. Contains 361609 sequences. (Running on oeis4.)