f-vectors for simplicial complexes of dimension at most 1 (graphs) on at most n-1 vertices.

Terms

a(0) =2a(1) =3a(2) =5a(3) =9a(4) =16a(5) =27a(6) =43a(7) =65a(8) =94a(9) =131a(10) =177a(11) =233a(12) =300a(13) =379a(14) =471a(15) =577a(16) =698a(17) =835a(18) =989a(19) =1161a(20) =1352a(21) =1563a(22) =1795a(23) =2049a(24) =2326a(25) =2627a(26) =2953a(27) =3305a(28) =3684a(29) =4091