OFFSET
1,1
COMMENTS
Column 3 of A260248
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 15*a(n-3) +20*a(n-4) -54*a(n-6) -128*a(n-7) -62*a(n-8) -12*a(n-9) +50*a(n-10) +335*a(n-11) +445*a(n-12) +138*a(n-13) -249*a(n-14) -161*a(n-15) +145*a(n-16) -398*a(n-17) -519*a(n-18) +118*a(n-19) -4*a(n-20) -60*a(n-21) +2*a(n-22) +16*a(n-23) +12*a(n-24) -36*a(n-25) +32*a(n-26) +8*a(n-27) -8*a(n-28) +8*a(n-29) for n>30
EXAMPLE
Some solutions for n=4
..0..1..0..0..0....1..0..0..0..0....0..1..0..0..1....0..1..0..0..1
..1..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..1..0
..0..0..0..0..1....0..1..0..0..1....1..0..0..0..0....0..0..0..0..0
..1..0..0..1..0....1..0..0..1..0....0..1..0..0..1....1..0..0..0..1
..0..1..0..0..0....0..0..0..0..0....0..0..0..1..0....0..1..0..0..0
..0..0..0..0..1....1..0..0..0..1....1..0..0..0..1....1..0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 20 2015
STATUS
approved