Number of isomorphism classes of connected (D_4)-fold coverings of a connected graph with circuit rank n.
A160873
Number of isomorphism classes of connected (D_4)-fold coverings of a connected graph with circuit rank n.
Terms
- a(0) =0a(1) =3a(2) =42a(3) =420a(4) =3720a(5) =31248a(6) =256032a(7) =2072640a(8) =16679040a(9) =133824768a(10) =1072169472a(11) =8583644160a(12) =68694312960a(13) =549655154688
External references
- oeis: A160873