0,2
Equals [1,2,3,...]*[1,0,4,0,10,0,20,...]*[1,0,0,6,0,0,21,...]*[1,0,0,0,8,0,0,0,36,...]*... [From Gary W. Adamson, Jul 06 2009]
Table of n, a(n) for n=0..15.
Square of A000219 = (1 + x + 3x^2 +6x^3 +13x^4 + ...)^2
A000219
Sequence in context: A037294 A076857 A174192 * A072338 A182197 A022726
Adjacent sequences: A161867 A161868 A161869 * A161871 A161872 A161873
nonn
Gary W. Adamson, Jun 20 2009
approved
