G.f. satisfies: A(x) = G(x)*A(x^3*G(x)^2) where G(x) is the g.f. of the Motzkin numbers (A001006).

A120895

G.f. satisfies: A(x) = G(x)*A(x^3*G(x)^2) where G(x) is the g.f. of the Motzkin numbers (A001006).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =30a(6) =78a(7) =206a(8) =552a(9) =1498a(10) =4105a(11) =11340a(12) =31541a(13) =88237a(14) =248076a(15) =700478a(16) =1985397a(17) =5646129a(18) =16104378a(19) =46056513a(20) =132031176a(21) =379315946a(22) =1091890772a(23) =3148736064a(24) =9095091878a(25) =26310816944a(26) =76219704957a(27) =221085782559a(28) =642058752476

External references