login
A232049
Number of 3Xn 0..1 arrays with no element less than a strict majority of its horizontal and antidiagonal neighbors
1
8, 21, 80, 318, 1315, 5364, 21680, 87452, 352931, 1425261, 5757064, 23253889, 93921193, 379334811, 1532086339, 6187939435, 24992490166, 100942222266, 407695589939, 1646641727295, 6650621491464, 26861196902537, 108489696252447
OFFSET
1,1
COMMENTS
Row 3 of A232047
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -27*a(n-2) +64*a(n-3) -104*a(n-4) +124*a(n-5) -102*a(n-6) +34*a(n-7) +10*a(n-8) -34*a(n-9) +19*a(n-10) -2*a(n-11) +a(n-12) +10*a(n-13) -2*a(n-14) -2*a(n-15) for n>18
EXAMPLE
Some solutions for n=7
..0..0..0..0..0..0..0....0..0..0..1..1..1..1....1..0..0..0..0..0..1
..1..0..0..1..0..0..1....1..0..0..0..1..0..0....0..0..0..0..0..1..0
..1..1..1..0..0..1..1....1..1..0..0..0..0..1....0..0..1..1..1..0..0
CROSSREFS
Sequence in context: A240516 A079386 A156304 * A225658 A226313 A275185
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 17 2013
STATUS
approved