Number of graphs with n nodes and n+1 edges.

Terms

a(0) =1a(1) =6a(2) =24a(3) =97a(4) =402a(5) =1637a(6) =6759a(7) =28259a(8) =119890a(9) =517121a(10) =2271860a(11) =10176660a(12) =46541024a(13) =217511951a(14) =1039651295a(15) =5084972068a(16) =25458149446a(17) =130480742790a(18) =684550272269