G.f. satisfies: A(x) = (1+x*A(x)^2)*(1+x^2*A(x)^2)*(1+x^3*A(x)^2).

A211854

G.f. satisfies: A(x) = (1+x*A(x)^2)*(1+x^2*A(x)^2)*(1+x^3*A(x)^2).

Terms

    a(0) =1a(1) =1a(2) =3a(3) =11a(4) =42a(5) =173a(6) =746a(7) =3321a(8) =15155a(9) =70516a(10) =333282a(11) =1595620a(12) =7722036a(13) =37715028a(14) =185661034a(15) =920244770a(16) =4588778327a(17) =23003827327a(18) =115867080623a(19) =586089365947

External references