Number of connected functions on n points with a loop of length 12.

Terms

a(0) =1a(1) =1a(2) =8a(3) =45a(4) =229a(5) =1043a(6) =4474a(7) =18034a(8) =69698a(9) =259516a(10) =938342a(11) =3308793a(12) =11427018a(13) =38763095a(14) =129499981a(15) =426937452a(16) =1391429896a(17) =4489322347a(18) =14356694844a(19) =45554354359a(20) =143546523999a(21) =449545164857