The Wiener index of the binomial tree of order n.

Terms

a(0) =0a(1) =1a(2) =10a(3) =68a(4) =392a(5) =2064a(6) =10272a(7) =49216a(8) =229504a(9) =1048832a(10) =4719104a(11) =20972544a(12) =92276736a(13) =402657280a(14) =1744838656a(15) =7516209152a(16) =32212287488a(17) =137439019008a(18) =584115683328