Sum of jump-lengths of all binary trees with n edges.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =17a(5) =100a(6) =506a(7) =2366a(8) =10556a(9) =45696a(10) =193800a(11) =810084a(12) =3350479a(13) =13748020a(14) =56071470a(15) =227613750a(16) =920540040a(17) =3711935040a(18) =14932102320a(19) =59951235420a(20) =240316859250a(21) =962056169256