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A260243 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001 1
256, 551, 1476, 3287, 8242, 22944, 56634, 134576, 355620, 930398, 2243778, 5643712, 14874838, 37124894, 91485986, 236607962, 604605716, 1496818690, 3791471588, 9741618048, 24444280948, 61293997138, 156547740090, 396868734430 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260248

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-3) +20*a(n-4) -54*a(n-6) -128*a(n-7) -62*a(n-8) -12*a(n-9) +50*a(n-10) +335*a(n-11) +445*a(n-12) +138*a(n-13) -249*a(n-14) -161*a(n-15) +145*a(n-16) -398*a(n-17) -519*a(n-18) +118*a(n-19) -4*a(n-20) -60*a(n-21) +2*a(n-22) +16*a(n-23) +12*a(n-24) -36*a(n-25) +32*a(n-26) +8*a(n-27) -8*a(n-28) +8*a(n-29) for n>30

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260248

Sequence in context: A045081 A294153 A235060 * A206137 A206130 A110297

Adjacent sequences:  A260240 A260241 A260242 * A260244 A260245 A260246

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 20 2015

STATUS

approved

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Last modified September 27 15:44 EDT 2021. Contains 347691 sequences. (Running on oeis4.)