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A282963 Number of nX2 0..1 arrays with no 1 equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements. 4
0, 0, 5, 17, 75, 295, 1062, 3811, 13107, 44498, 148305, 488130, 1588811, 5122801, 16384193, 52029375, 164193163, 515276894, 1609014076, 5001795369, 15485379275, 47764505823, 146829462806, 449951243863, 1374888588530, 4189987614075 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Column 2 of A282969.
LINKS
FORMULA
Empirical: a(n) = 3*a(n-1) +9*a(n-2) -14*a(n-3) -51*a(n-4) -18*a(n-5) +82*a(n-6) +156*a(n-7) +177*a(n-8) +162*a(n-9) +114*a(n-10) +63*a(n-11) +31*a(n-12) +12*a(n-13) +3*a(n-14) +a(n-15)
EXAMPLE
Some solutions for n=4
..0..0. .0..1. .0..0. .0..0. .0..1. .1..0. .0..0. .1..1. .1..1. .1..1
..1..1. .0..1. .1..1. .1..0. .1..0. .0..1. .0..1. .0..1. .0..1. .0..1
..0..1. .0..1. .0..1. .1..0. .1..0. .1..0. .1..0. .1..0. .1..0. .0..1
..1..0. .1..0. .0..1. .1..1. .1..0. .1..1. .1..1. .0..0. .0..1. .0..0
CROSSREFS
Cf. A282969.
Sequence in context: A149727 A149728 A149729 * A149730 A149731 A149732
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2017
STATUS
approved

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Last modified May 29 05:33 EDT 2024. Contains 372921 sequences. (Running on oeis4.)