A192069 (A192249)/5.

0, 1, 4, 18, 60, 186, 522, 1380, 3459, 8321, 19332, 43629, 96045, 206953, 437677, 910549, 1866952, 3778561, 7558953, 14963504, 29340482, 57033862, 109989752, 210575822, 400452782, 756836537, 1422191570, 2658250044, 4943946756, 9152396892

Offset: 1

Author

Clark Kimberling, Jun 27 2011

Keywords

• nonn

Comments

See A192232, A192249.

Crossrefs

Cf. A192232, A192248, A192249.

Programs

Mathematica

(See A192248.)

Formula

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