OFFSET
1,2
COMMENTS
Column 3 of A299588.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-2) +5*a(n-3) -19*a(n-4) -16*a(n-5) +10*a(n-6) +32*a(n-7) -30*a(n-9) +75*a(n-10) +16*a(n-11) -99*a(n-12) -51*a(n-13) +52*a(n-14) +25*a(n-15) -4*a(n-16) +a(n-17) -2*a(n-18) -a(n-19) for n>20.
EXAMPLE
Some solutions for n=7
..0..0..0. .0..0..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .0..0..0. .0..1..0. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..0..0. .1..1..1
..0..1..0. .0..1..0. .1..1..0. .0..0..0. .1..1..1. .1..0..0. .1..1..1
..1..0..0. .0..0..1. .1..1..1. .0..0..0. .1..1..1. .0..1..1. .1..1..1
..1..1..0. .0..1..1. .1..1..1. .1..1..1. .0..0..0. .1..1..1. .1..0..1
..1..1..0. .0..1..1. .1..1..1. .1..1..1. .0..0..0. .1..1..1. .1..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2018
STATUS
approved