OFFSET
0,2
COMMENTS
Odd cubes have no self-complementary plane partitions.
LINKS
R. P. Stanley, Symmetries of Plane Partitions, J. Comb. Theory Ser. A 43 (1986), 103-113.
P. J. Taylor, Counting distinct dimer hex tilings, Preprint, 2015.
FORMULA
a(n) = Product_{i=0..n-1} i!^2 (i+2n)!^2 / (i+n)!^4.
a(n) = A008793(n)^2.
PROG
(PARI) a(n) = prod(i=0, n-1, i!^2*(i+2*n)!^2 / (i+n)!^4) \\ Michel Marcus, Jun 18 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Peter J. Taylor, Jun 17 2015
STATUS
approved