Number of disconnected regular graphs with n nodes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =1a(6) =3a(7) =2a(8) =5a(9) =4a(10) =9a(11) =7a(12) =23a(13) =18a(14) =74a(15) =106a(16) =619a(17) =2076a(18) =22526a(19) =112834a(20) =4799825a(21) =31138965a(22) =4207943011a(23) =115979718015