login
A302682
Number of 4Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
1
8, 6, 7, 20, 30, 76, 217, 509, 1189, 3034, 7569, 18274, 44932, 111561, 274057, 672217, 1657278, 4083105, 10038822, 24702412, 60827449, 149699125, 368356029, 906653234, 2231584641, 5492001706, 13516457764, 33267138281, 81875898241
OFFSET
1,1
COMMENTS
Row 4 of A302680.
LINKS
FORMULA
Empirical: a(n) = a(n-1) +a(n-2) +5*a(n-3) +5*a(n-4) -3*a(n-5) -3*a(n-6) +2*a(n-7) for n>11
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..0..0..0. .0..1..1..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
..0..1..0..0..0. .0..1..0..1..0. .0..0..0..1..0. .0..1..0..1..0
..0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0. .0..1..0..1..0
CROSSREFS
Cf. A302680.
Sequence in context: A011465 A192409 A159627 * A011298 A355185 A188655
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 11 2018
STATUS
approved