Number of disconnected regular simple graphs on n vertices with girth exactly 5.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =1a(11) =1a(12) =1a(13) =1a(14) =1a(15) =2a(16) =2a(17) =3a(18) =3a(19) =4a(20) =6a(21) =6a(22) =9a(23) =9a(24) =22a(25) =13a(26) =82a(27) =18a(28) =618a(29) =26