login
A269085
Number of nX4 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.
1
13, 76, 428, 2238, 11314, 55620, 268289, 1274435, 5982734, 27813229, 128268964, 587560638, 2675945006, 12126527636, 54715085702, 245932380152, 1101667424213, 4920048498594, 21913218006880, 97358802936939, 431593734805059
OFFSET
1,1
COMMENTS
Column 4 of A269089.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +19*a(n-2) +10*a(n-3) -122*a(n-4) -320*a(n-5) -295*a(n-6) +8*a(n-7) +176*a(n-8) +20*a(n-9) -98*a(n-10) -6*a(n-11) +43*a(n-12) -6*a(n-13) -11*a(n-14) +6*a(n-15) -a(n-16)
EXAMPLE
Some solutions for n=4
..1..0..0..1. .1..1..0..0. .0..0..0..0. .0..0..1..0. .1..0..0..0
..1..0..0..0. .0..0..0..1. .1..0..1..0. .0..0..0..1. .0..0..1..0
..0..1..0..1. .0..0..0..0. .1..0..0..0. .0..0..1..0. .0..0..0..1
..0..0..0..0. .0..1..0..1. .0..1..0..0. .1..0..0..0. .0..0..0..0
CROSSREFS
Cf. A269089.
Sequence in context: A050485 A034265 A282643 * A182077 A269071 A283539
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 19 2016
STATUS
approved