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A283411
Number of nX4 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors.
1
16, 236, 2944, 39268, 519252, 6865368, 90803472, 1200890168, 15882218184, 210047690772, 2777952473964, 36739369719812, 485890702739492, 6426070385501460, 84986974086126936, 1123981738831575460
OFFSET
1,1
COMMENTS
Column 4 of A283415.
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) +58*a(n-2) +137*a(n-3) +127*a(n-4) +60*a(n-5) -128*a(n-6) +83*a(n-7) -150*a(n-8) +97*a(n-9) -59*a(n-10) +32*a(n-11) -9*a(n-12) +a(n-13) for n>15
EXAMPLE
Some solutions for n=4
..0..0..1..1. .1..0..0..0. .0..0..0..1. .1..0..1..0. .0..1..0..1
..0..0..0..1. .1..1..1..1. .0..1..0..1. .0..1..0..1. .1..0..1..0
..1..0..1..1. .0..0..0..0. .0..1..0..0. .0..0..0..0. .0..0..0..0
..1..1..0..0. .0..0..1..1. .0..0..1..1. .0..0..1..0. .0..0..1..0
CROSSREFS
Cf. A283415.
Sequence in context: A283853 A266099 A264343 * A161591 A376641 A227440
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2017
STATUS
approved