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A260605 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101 1
241, 532, 1334, 3388, 8736, 22944, 59758, 156228, 410004, 1074706, 2810634, 7356614, 19275408, 50484816, 132179260, 346084882, 906235472, 2373216196, 6214897284, 16273805984, 42611987122, 111584761940, 292206789126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A260609

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-3) +21*a(n-4) +27*a(n-5) +29*a(n-6) -3*a(n-7) -99*a(n-8) -39*a(n-9) +194*a(n-10) +217*a(n-11) +274*a(n-12) +128*a(n-13) -364*a(n-14) -186*a(n-15) -21*a(n-16) -414*a(n-17) +418*a(n-18) +666*a(n-19) -73*a(n-20) -2*a(n-21) -272*a(n-22) -183*a(n-23) +66*a(n-24) -47*a(n-25) +280*a(n-26) +294*a(n-27) +147*a(n-28) +291*a(n-29) +70*a(n-30) -35*a(n-32) -39*a(n-33) -33*a(n-34) -34*a(n-35) -18*a(n-36) -4*a(n-37) for n>40

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260609

Sequence in context: A157961 A142233 A142275 * A097020 A163623 A142856

Adjacent sequences:  A260602 A260603 A260604 * A260606 A260607 A260608

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 29 2015

STATUS

approved

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Last modified October 17 05:58 EDT 2021. Contains 348048 sequences. (Running on oeis4.)