Number of isomorphism classes of 4-regular loopless multigraphs of order n.

A129418

Number of isomorphism classes of 4-regular loopless multigraphs of order n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =4a(5) =7a(6) =24a(7) =60a(8) =240a(9) =930a(10) =4701a(11) =26637a(12) =178569a(13) =1339529a(14) =11187064a(15) =101871881a(16) =1002594996a(17) =10574095327a(18) =118850827173

External references