187986

Appears in sequences

• Expansion of (1+x^3*C^4)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=10A071740
• Sum_{k=1..n} (k(k+1))^2/2.at n=16A086755
• Expansion of (1/x) * Series_Reversion( x / (1 + x^3 * (1 + x)^2) ).at n=19A389129