OFFSET
1,1
COMMENTS
Column 3 of A236893.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 21*a(n-1) -56*a(n-2) -1596*a(n-3) +10598*a(n-4) +37506*a(n-5) -458265*a(n-6) -65787*a(n-7) +9671623*a(n-8) -11880327*a(n-9) -116841126*a(n-10) +239765418*a(n-11) +846977784*a(n-12) -2328600336*a(n-13) -3613321941*a(n-14) +13171406553*a(n-15) +7958267644*a(n-16) -45136203792*a(n-17) -3285801844*a(n-18) +93007353972*a(n-19) -22546601120*a(n-20) -112104741744*a(n-21) +48327996864*a(n-22) +75881646528*a(n-23) -41191019008*a(n-24) -27175387392*a(n-25) +16504756224*a(n-26) +4679811072*a(n-27) -3017687040*a(n-28) -297271296*a(n-29) +198180864*a(n-30).
EXAMPLE
Some solutions for n=4
..0..2..0..2....0..2..2..2....2..0..0..2....1..2..1..0....0..1..2..1
..1..0..1..2....1..0..1..0....1..2..1..0....2..0..2..2....0..1..0..1
..0..2..0..0....2..0..2..2....0..2..0..2....1..0..1..0....2..1..2..1
..1..0..1..2....2..1..0..1....0..1..2..1....2..0..2..0....2..1..2..1
..0..2..2..0....0..2..0..2....0..2..0..2....2..1..2..1....1..0..1..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 01 2014
STATUS
approved