0,2

Also one eighth of the fourth diagonal of triangle A115195, called Y(1,2).

a(n)= A115195(3+n,1+n)/8, n>=0.

G.f.: (-1 + 3*x + (1- 5*x + 2*x^2)*c(2*x))/(4*(1+x)*x^3), with the o.g.f. c(x) of A000108 (Catalan).

a(n)= A115193(4+n,4), n>=0.

Sequence in context: A106132 A105287 A016130 this_sequence A002051 A133120 A048742

Adjacent sequences: A115199 A115200 A115201 this_sequence A115203 A115204 A115205

nonn

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 03 2006