Number of ordered trees with n edges having no odd-length branches starting at the root.

A127539

Number of ordered trees with n edges having no odd-length branches starting at the root.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =3a(5) =3a(6) =16a(7) =37a(8) =134a(9) =411a(10) =1411a(11) =4747a(12) =16500a(13) =57671a(14) =204380a(15) =730032a(16) =2629637a(17) =9535268a(18) =34787215a(19) =127585608a(20) =470162614a(21) =1739952061a(22) =6463845941a(23) =24096378885a(24) =90112499714a(25) =337965831635

External references