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A283567
Number of nX3 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
1
1, 26, 169, 1108, 6453, 36038, 194173, 1021432, 5275885, 26869458, 135310457, 675163708, 3343196861, 16447661790, 80470971869, 391822686752, 1899839181365, 9177752354378, 44190339947417, 212148874972196, 1015791721800101
OFFSET
1,2
COMMENTS
Column 3 of A283572.
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) -27*a(n-2) -4*a(n-3) +89*a(n-4) -106*a(n-5) -85*a(n-6) +228*a(n-7) -60*a(n-8) -192*a(n-9) +144*a(n-10) +64*a(n-11) -64*a(n-12)
EXAMPLE
Some solutions for n=4
..1..0..0. .1..1..1. .0..1..0. .0..1..1. .0..1..0. .1..1..1. .0..1..0
..1..1..0. .1..0..0. .0..0..0. .0..0..0. .0..1..1. .0..0..0. .1..0..0
..1..0..1. .0..0..0. .0..0..1. .1..0..1. .0..0..0. .1..0..1. .1..0..1
..1..0..1. .1..1..0. .0..1..1. .0..1..1. .0..1..1. .0..0..0. .0..1..0
CROSSREFS
Cf. A283572.
Sequence in context: A249292 A279744 A214353 * A037052 A156339 A268331
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2017
STATUS
approved