OFFSET
1,2
COMMENTS
Row 4 of A213118.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Recurrence: n*(7*n-19)*a(n) = 2*(28*n^2-97*n+60)*a(n-1) - 8*(2*n-5)*(7*n-12) * a(n-2). - Vaclav Kotesovec, Oct 19 2012
a(n) = 2^(2*n+2) - 5*(7*n-4)*C(2*n-2,n-1)/n. - Vaclav Kotesovec, Oct 29 2012
EXAMPLE
Some solutions for n=3
..0....0....1....0....0....0....0....0....0....0....1....1....1....1....0....1
..0....0....0....0....0....1....0....1....1....0....1....0....0....0....0....0
..1....1....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....0....0....1....0....0....0....1....0....1....0....0....0....0....0....1
..1....0....1....0....1....1....0....0....1....1....0....0....0....0....0....0
..0....0....0....0....1....0....0....0....0....0....0....0....1....0....0....0
..0....0....0....0....0....0....0....0....0....0....1....0....0....1....0....0
..0....1....0....1....0....0....0....0....0....0....0....1....1....0....1....0
..0....1....1....0....0....1....0....0....0....0....0....1....0....0....1....0
MATHEMATICA
Table[2^(2*n+2)-5*(7*n-4)*Binomial[2*n-2, n-1]/n, {n, 1, 20}] (* Vaclav Kotesovec, Oct 29 2012 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 05 2012
STATUS
approved