A260100 - OEIS

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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

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