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A260603 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101 1
58, 118, 250, 532, 1136, 2480, 5418, 11776, 25694, 56138, 122376, 266782, 582226, 1270070, 2769414, 6041044, 13178442, 28742456, 62690698, 136748242, 298274638, 650578696, 1419055920, 3095272272, 6751343236, 14725993444, 32120472836 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260609

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +4*a(n-3) +3*a(n-4) +2*a(n-6) +2*a(n-7) -4*a(n-8) +3*a(n-9) +4*a(n-10) -a(n-11) +a(n-12) +a(n-13) for n>14

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260609

Sequence in context: A266451 A124680 A181462 * A188238 A044245 A044626

Adjacent sequences:  A260600 A260601 A260602 * A260604 A260605 A260606

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 29 2015

STATUS

approved

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Last modified July 17 23:21 EDT 2019. Contains 325109 sequences. (Running on oeis4.)