Number of ordered trees with n edges such that non-leaf vertices at even (odd) level have an even (odd) number of children.

A248097

Number of ordered trees with n edges such that non-leaf vertices at even (odd) level have an even (odd) number of children.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =2a(4) =2a(5) =8a(6) =15a(7) =34a(8) =93a(9) =208a(10) =548a(11) =1390a(12) =3527a(13) =9318a(14) =24203a(15) =64052a(16) =170392a(17) =454020a(18) =1220651a(19) =3288010a(20) =8897474a(21) =24170066a(22) =65829806a(23) =179901956a(24) =492872483a(25) =1353655974a(26) =3726557183a(27) =10280008874a(28) =28415211437a(29) =78686254872

External references