OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
Olivia X. M. Yao, Ernest X. W. Xia, Combinatorial proofs of five formulas of Liouville, Discrete Math. 318 (2014), 1--9. MR3141622.
FORMULA
Yao and Xia give an explicit formula for a(n) due to Liouville.
G.f.: theta_3(q)*theta_3(q^4)^3, where theta_3() is the Jacobi theta function. - Ilya Gutkovskiy, Aug 03 2018
CROSSREFS
KEYWORD
nonn,look
AUTHOR
N. J. A. Sloane, Feb 14 2014
STATUS
approved