Bisection of half-convolution of Catalan sequence A000108; even part.

A201205

Bisection of half-convolution of Catalan sequence A000108; even part.

Terms

    a(0) =1a(1) =3a(2) =23a(3) =227a(4) =2529a(5) =30275a(6) =380162a(7) =4939443a(8) =65844845a(9) =895451117a(10) =12374186318a(11) =173257703723

External references