Number of multigraphs with 5 nodes and n edges.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =17a(5) =35a(6) =76a(7) =149a(8) =291a(9) =539a(10) =974a(11) =1691a(12) =2874a(13) =4730a(14) =7620a(15) =11986a(16) =18485a(17) =27944a(18) =41550a(19) =60744a(20) =87527a(21) =124338a(22) =174403a(23) =241650a(24) =331153a(25) =448987a(26) =602853a(27) =801943a(28) =1057615a(29) =1383343