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A260495 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011 1
83, 136, 347, 683, 942, 2115, 4393, 6800, 13290, 27885, 47140, 86478, 177017, 317762, 571813, 1132672, 2104849, 3796781, 7316331, 13812624, 25170727, 47622068, 90289367, 166305539, 311514903, 589735035, 1095258406, 2043057469, 3854473062 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260501

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) -7*a(n-6) -18*a(n-7) -10*a(n-8) +5*a(n-9) +7*a(n-10) +16*a(n-11) +6*a(n-12) -4*a(n-13) -3*a(n-15) -2*a(n-16) +a(n-17) for n>19

EXAMPLE

Some solutions for n=4

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

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

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

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

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

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

CROSSREFS

Cf. A260501

Sequence in context: A142409 A210527 A140038 * A165502 A126711 A039548

Adjacent sequences:  A260492 A260493 A260494 * A260496 A260497 A260498

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 27 2015

STATUS

approved

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Last modified June 13 03:46 EDT 2021. Contains 344980 sequences. (Running on oeis4.)