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A260604 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101 1
125, 250, 610, 1334, 3343, 7516, 19069, 42696, 108592, 244492, 620922, 1394188, 3543940, 7964144, 20236020, 45470332, 115549194, 259609220, 659718394, 1482402604, 3766971094, 8463829616, 21508165126, 48327274404, 122806995718 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260609

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-2) +14*a(n-4) +9*a(n-6) -25*a(n-8) +136*a(n-10) -65*a(n-12) -59*a(n-14) +111*a(n-16) -55*a(n-18) +22*a(n-20) -32*a(n-22) +18*a(n-24) for n>29

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260609

Sequence in context: A031473 A045214 A045199 * A023079 A172460 A338469

Adjacent sequences:  A260601 A260602 A260603 * A260605 A260606 A260607

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 29 2015

STATUS

approved

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Last modified October 24 10:03 EDT 2021. Contains 348225 sequences. (Running on oeis4.)