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A259995
Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00000101
1
99, 269, 805, 1819, 4383, 12412, 32525, 82616, 222474, 598599, 1577548, 4210492, 11316402, 30215951, 80758149, 216596656, 580222858, 1553421000, 4163544562, 11159591352, 29901049773, 80136519668, 214797758849, 575682349029
OFFSET
1,1
COMMENTS
Column 2 of A260001
LINKS
FORMULA
Empirical: a(n) = a(n-1) +2*a(n-2) +10*a(n-3) +5*a(n-4) -19*a(n-5) -33*a(n-6) -45*a(n-7) -a(n-8) +25*a(n-9) +13*a(n-10) +5*a(n-11) +3*a(n-12) +9*a(n-13) +8*a(n-14)
EXAMPLE
Some solutions for n=4
..0..1..0..0....1..0..1..1....1..0..1..0....1..1..0..0....1..0..0..1
..0..0..1..0....0..0..0..0....0..1..0..0....0..1..0..0....0..0..0..1
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..0....0..1..0..0....0..0..0..0....0..0..0..0....1..0..0..1
..0..1..0..0....0..0..1..0....0..1..0..0....0..1..0..0....0..0..0..1
..1..0..0..0....0..0..0..0....0..1..0..0....0..1..0..0....0..0..0..0
CROSSREFS
Sequence in context: A250734 A260279 A250779 * A125820 A008902 A008882
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2015
STATUS
approved