Triangle read by rows where T(n,k) is the number of labeled loop-graphs with n vertices and n edges, k of which are loops.
A368928
Triangle read by rows where T(n,k) is the number of labeled loop-graphs with n vertices and n edges, k of which are loops.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =1a(6) =1a(7) =9a(8) =9a(9) =1a(10) =15a(11) =80a(12) =90a(13) =24a(14) =1a(15) =252a(16) =1050a(17) =1200a(18) =450a(19) =50a(20) =1a(21) =5005a(22) =18018a(23) =20475a(24) =9100a(25) =1575a(26) =90a(27) =1a(28) =116280a(29) =379848
External references
- oeis: A368928