Number of loopless multigraphs with 7 nodes and n edges.

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =22a(5) =60a(6) =173a(7) =471a(8) =1303a(9) =3510a(10) =9234a(11) =23574a(12) =58464a(13) =140340a(14) =326792a(15) =738090a(16) =1619321a(17) =3455129a(18) =7180856a(19) =14555856a(20) =28819926a(21) =55808840a(22) =105834657a(23) =196779279a(24) =359124362a(25) =643976482a(26) =1135731758a(27) =1971734302a(28) =3372477533