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A260100 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101 1
85, 201, 477, 1151, 2794, 6804, 16453, 39854, 96501, 233975, 566755, 1373344, 3326942, 8061337, 19530608, 47321405, 114650673, 277784695, 673027156, 1630654912, 3950831441, 9572304480, 23192285181, 56191572297, 136144001797 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260106

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +12*a(n-4) -a(n-5) -8*a(n-6) +2*a(n-7) -51*a(n-8) -22*a(n-9) -12*a(n-10) -46*a(n-11) +31*a(n-12) +12*a(n-13) -21*a(n-14) +18*a(n-15) -6*a(n-16) -18*a(n-17) for n>18

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A260106

Sequence in context: A037979 A044417 A044798 * A072289 A211257 A027524

Adjacent sequences:  A260097 A260098 A260099 * A260101 A260102 A260103

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 16 2015

STATUS

approved

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Last modified January 24 21:49 EST 2022. Contains 350565 sequences. (Running on oeis4.)