OFFSET
1,3
COMMENTS
Row 2 of A283950.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 6*a(n-1) -7*a(n-2) +8*a(n-3) -31*a(n-4) -50*a(n-5) -61*a(n-6) -84*a(n-7) -36*a(n-8).
Empirical g.f.: G.f.: 2*x^3*(1+x)^2/(-1+3*x+x^2+7*x^3+6*x^4)^2 . - R. J. Mathar, Mar 21 2017
EXAMPLE
Some solutions for n=4
..1..1..1..1. .1..0..1..0. .1..1..1..0. .1..1..0..1. .1..0..1..1
..1..0..1..1. .1..1..1..0. .1..0..1..0. .0..1..1..1. .1..1..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 18 2017
STATUS
approved