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A260171 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001 1
74, 167, 419, 1001, 2500, 6344, 15847, 39584, 99741, 250297, 626433, 1572166, 3946872, 9894451, 24814854, 62266809, 156182193, 391707889, 982630798, 2464919670, 6182653471, 15508493498, 38902275855, 97581089767, 244769200723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260177

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) +5*a(n-4) -3*a(n-5) +5*a(n-6) +9*a(n-7) -5*a(n-8) -5*a(n-9) +4*a(n-10) -17*a(n-11) -14*a(n-12) +4*a(n-13) -4*a(n-14) -4*a(n-15) for n>16

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260177

Sequence in context: A044706 A217991 A105053 * A044406 A044787 A204370

Adjacent sequences:  A260168 A260169 A260170 * A260172 A260173 A260174

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 17 2015

STATUS

approved

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Last modified July 20 11:28 EDT 2019. Contains 325180 sequences. (Running on oeis4.)