OFFSET
1,1
COMMENTS
Column 1 and row 1 of A258554
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) -5*a(n-2) +2*a(n-3)
a(n) = 16*2^n - 4*n - 12. - Michael Somos, Oct 14 2020
EXAMPLE
Some solutions for n=4
..0..0....0..1....0..1....0..0....0..0....0..1....1..0....0..0....0..1....0..1
..0..1....0..1....1..0....0..0....1..1....0..0....1..0....1..0....0..1....0..0
..1..1....0..1....1..0....1..1....0..0....1..0....1..1....1..0....1..1....0..0
..1..0....1..1....0..0....1..0....0..1....1..1....1..1....0..0....1..0....1..0
..0..0....0..1....0..1....0..1....1..1....1..1....0..1....1..1....1..0....1..1
PROG
(PARI) {a(n) = if(n<-2, 0, 16*2^n - 4*n - 12)}; /* Michael Somos, Oct 14 2020 */
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 03 2015
STATUS
approved