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See A192232, A192249.
Table of n, a(n) for n=1..30.
Conjecture: G.f.: x^2*(1-2*x+4*x^2-3*x^3+x^4) / ( (x-1)*(x^2+x-1)^5 ). - R. J. Mathar, May 04 2014
Cf. A192232, A192248, A192249.
Sequence in context: A167885 A212521 A278406 * A073373 A292465 A227162
Adjacent sequences: A192066 A192067 A192068 * A192070 A192071 A192072
Clark Kimberling, Jun 27 2011