OFFSET
1,1
COMMENTS
Row 7 of A249844.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..55
FORMULA
Empirical: a(n) = n^11 - (118/105)*n^10 + (99637/15120)*n^9 - (27427/5040)*n^8 + (339/40)*n^7 + (33/20)*n^6 - (4957/720)*n^5 + (15979/1680)*n^4 - (34751/7560)*n^3 + (1019/2520)*n^2 + (5/12)*n.
Conjectures from Colin Barker, Aug 18 2017: (Start)
G.f.: x*(10 + 3846*x + 176573*x^2 + 2104937*x^3 + 8824523*x^4 + 14875683*x^5 + 10543155*x^6 + 3058279*x^7 + 321259*x^8 + 8535*x^9) / (1 - x)^12.
a(n) = 12*a(n-1) - 66*a(n-2) + 220*a(n-3) - 495*a(n-4) + 792*a(n-5) - 924*a(n-6) + 792*a(n-7) - 495*a(n-8) + 220*a(n-9) - 66*a(n-10) + 12*a(n-11) - a(n-12) for n>12.
(End)
EXAMPLE
Some solutions for n=2
..0....0....2....2....2....0....0....1....2....1....0....2....1....0....1....2
..1....0....1....0....0....1....0....2....0....0....2....0....0....1....2....0
..1....1....2....1....2....2....2....2....0....2....2....0....0....2....2....1
..0....1....0....2....0....2....1....2....2....2....1....1....2....2....0....0
..2....1....0....0....2....0....1....0....1....2....0....1....1....2....2....2
..0....0....2....2....2....2....0....0....2....1....2....1....2....0....1....1
..1....0....1....2....0....1....0....2....0....0....0....0....2....1....2....0
..2....1....1....1....1....2....2....1....2....2....1....0....0....2....0....1
..2....1....0....2....2....0....2....2....0....2....1....1....2....0....0....0
..0....2....0....1....0....2....1....0....1....2....0....1....1....1....1....2
..2....0....2....2....1....2....0....2....2....0....2....2....2....0....2....2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 07 2014
STATUS
approved