OFFSET
1,1
COMMENTS
Row 4 of A267667.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-1) +46*a(n-2) -255*a(n-3) -804*a(n-4) +5287*a(n-5) +6393*a(n-6) -57990*a(n-7) -17379*a(n-8) +368289*a(n-9) -70362*a(n-10) -1394997*a(n-11) +645844*a(n-12) +3138583*a(n-13) -1858369*a(n-14) -4077534*a(n-15) +2440404*a(n-16) +2940332*a(n-17) -1387260*a(n-18) -1138872*a(n-19) +275184*a(n-20) +183456*a(n-21)
EXAMPLE
Some solutions for n=7
..0..1..0..0..1..0..1....0..1..0..1..1..0..0....0..0..1..0..1..0..1
..0..0..1..0..1..1..0....0..0..1..0..1..0..1....0..1..0..1..1..0..0
..1..0..1..0..1..0..1....0..1..0..1..1..0..0....1..0..1..0..1..0..0
..0..1..1..0..1..0..0....0..1..1..0..0..1..0....0..0..1..0..1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 19 2016
STATUS
approved