OFFSET
1,1
COMMENTS
Column 7 of A228390
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 9*a(n-1) +203*a(n-2) -210*a(n-3) -5659*a(n-4) +6975*a(n-5) +48558*a(n-6) -82823*a(n-7) -127405*a(n-8) +308107*a(n-9) +21372*a(n-10) -340142*a(n-11) +100779*a(n-12) +139011*a(n-13) -54187*a(n-14) -25564*a(n-15) +9369*a(n-16) +2227*a(n-17) -546*a(n-18) -87*a(n-19) +9*a(n-20) +a(n-21)
EXAMPLE
Some solutions for n=4
..1..0..1..0..0..1..0....1..0..0..1..0..1..0....1..0..0..1..0..0..0
..0..0..0..1..0..0..1....0..0..0..0..0..0..0....0..1..0..0..0..0..1
..0..0..1..0..0..1..0....1..0..0..0..0..0..1....0..0..0..1..0..0..0
..1..0..0..0..0..0..1....0..1..0..1..0..0..0....1..0..1..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 21 2013
STATUS
approved