OFFSET
1,1
COMMENTS
Column 4 of A262319.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 13*a(n-1) -30*a(n-2) +775*a(n-3) -10075*a(n-4) +23250*a(n-5) -187265*a(n-6) +2434445*a(n-7) -5617950*a(n-8) +18375455*a(n-9) -238880915*a(n-10) +551263650*a(n-11) -585288123*a(n-12) +7608745599*a(n-13) -17558643690*a(n-14) -12851058675*a(n-15) +167063762775*a(n-16) -385531760250*a(n-17) +757921180765*a(n-18) -9852975349945*a(n-19) +22737635422950*a(n-20) -1115961555955*a(n-21) +14507500227415*a(n-22) -33478846678650*a(n-23) -69403913471776*a(n-24) +902250875133088*a(n-25) -2082117404153280*a(n-26) -67517783528000*a(n-27) +877731185864000*a(n-28) -2025533505840000*a(n-29)
EXAMPLE
Some solutions for n=4
..0..1..0..1..0..1....1..1..0..0..0..1....1..1..1..1..1..1....1..1..1..0..0..0
..1..0..1..0..1..0....0..1..0..1..0..1....0..1..1..1..0..0....0..1..0..1..0..1
..1..0..0..0..1..1....0..0..0..1..1..1....0..0..0..1..1..1....0..0..1..1..1..0
..1..0..1..0..1..0....0..0..0..1..1..1....0..0..0..0..0..0....0..0..0..1..1..1
..0..1..0..1..0..1....1..0..0..0..1..1....1..0..0..0..1..1....1..0..1..0..1..0
..0..1..1..1..0..0....1..1..0..0..0..1....1..1..1..0..0..0....1..1..0..0..0..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 17 2015
STATUS
approved