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A251287
Number of (n+1)X(3+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally
1
52, 219, 822, 3390, 12954, 52474, 202882, 813336, 3168621, 12623928, 49416048, 196129247, 770019542, 3049031658, 11992662293, 47418860005, 186721692802, 737641381117, 2906639008138, 11476362571548, 45241436664983
OFFSET
1,1
COMMENTS
Column 3 of A251292
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +17*a(n-2) -25*a(n-3) -74*a(n-4) +87*a(n-5) +108*a(n-6) -77*a(n-7) -72*a(n-8) +15*a(n-9) +18*a(n-10) +2*a(n-11)
EXAMPLE
Some solutions for n=4
..0..1..0..1....1..0..1..1....1..1..1..0....0..0..0..1....1..0..0..1
..0..1..0..1....0..0..0..0....0..0..0..0....0..1..0..1....0..1..0..0
..0..1..0..0....1..0..1..0....1..1..1..1....0..1..0..1....0..1..0..1
..0..0..1..1....1..0..0..0....0..0..0..0....0..1..0..0....0..0..0..0
..1..0..0..0....1..0..1..0....0..1..1..1....0..0..1..0....1..0..1..1
CROSSREFS
Sequence in context: A211564 A346825 A346858 * A023417 A122239 A086860
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 01 2014
STATUS
approved