0,2

G.f.: A(x) = (1+x) - x^2*(1+x)^2 + x*A(x)^2.

a(3)=-2-1+6+5=8, a(4)=-1-6+0+20+14=27, a(5)=0-5-22+10+70+42=95.

Cf. A086612 (triangle), A086634.

Sequence in context: A107704 A041399 A041503 this_sequence A121401 A093858 A080568

Adjacent sequences: A086610 A086611 A086612 this_sequence A086614 A086615 A086616

nonn

Paul D. Hanna (pauldhanna(AT)juno.com), Jul 24 2003