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See A192232, A192250.
Table of n, a(n) for n=1..23.
a(n) = 2*A192070(n).
Conjecture: (n-1)*(n-2)*a(n) -(5*n-7)*(n-2)*a(n-1) -2*(2*n-3)*(3*n-8)*a(n-2) +4*(2*n-3)*(2*n-5)*a(n-3)=0. - R. J. Mathar, May 04 2014
Cf. A192232, A192250, A192070.
Sequence in context: A173841 A004141 A009693 * A104190 A152661 A177066
Adjacent sequences: A192248 A192249 A192250 * A192252 A192253 A192254
Clark Kimberling, Jun 27 2011