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A259246 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0011 or 0111 1
111, 581, 2816, 14425, 71313, 361728, 1803859, 9106657, 45601304, 229700941, 1152550829, 5799573000, 29129216479, 146507741197, 736226561792, 3702139968817, 18608625262249, 93565783612448, 470365315223067 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A259250

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +12*a(n-2) -141*a(n-3) +15*a(n-4) +798*a(n-5) -177*a(n-6) -1505*a(n-7) -48*a(n-8) +375*a(n-9) -a(n-10) -6*a(n-11)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Cf. A259250

Sequence in context: A277960 A304831 A304516 * A205830 A302228 A302671

Adjacent sequences:  A259243 A259244 A259245 * A259247 A259248 A259249

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 22 2015

STATUS

approved

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Last modified October 20 21:21 EDT 2021. Contains 348119 sequences. (Running on oeis4.)