Maximal number of edges in a graceful graph on n nodes.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =9a(5) =13a(6) =17a(7) =23a(8) =29a(9) =36a(10) =43a(11) =50a(12) =58a(13) =68a(14) =79a(15) =90a(16) =101a(17) =112a(18) =123a(19) =138a(20) =153a(21) =168a(22) =183a(23) =198a(24) =213a(25) =232