OFFSET
1,1
COMMENTS
Column 3 of A221666.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 8*a(n-1) +360*a(n-5) -2880*a(n-6) -47232*a(n-10) +377856*a(n-11) +2872320*a(n-15) -22978560*a(n-16) -92491776*a(n-20) +739934208*a(n-21) +1689550848*a(n-25) -13516406784*a(n-26) -18150850560*a(n-30) +145206804480*a(n-31) +113850187776*a(n-35) -910801502208*a(n-36) -386547056640*a(n-40) +3092376453120*a(n-41) +549755813888*a(n-45) -4398046511104*a(n-46).
EXAMPLE
Some solutions for n=3
..1..1..1....1..0..0....0..0..1....0..1..1....0..0..1....1..0..0....1..1..0
..0..1..0....0..0..0....0..0..0....0..1..0....0..0..1....1..1..1....1..1..0
..0..0..1....1..1..1....0..1..1....1..0..1....1..0..1....1..1..1....0..0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 21 2013
STATUS
approved