T(n,k) is the number of labeled graphs of n vertices and k edges that have endpoints, where an endpoint is a vertex with degree 1.

A245796

T(n,k) is the number of labeled graphs of n vertices and k edges that have endpoints, where an endpoint is a vertex with degree 1.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =3a(4) =6a(5) =15a(6) =16a(7) =12a(8) =10a(9) =45a(10) =110a(11) =195a(12) =210a(13) =120a(14) =20a(15) =15a(16) =105a(17) =435a(18) =1320a(19) =2841a(20) =4410a(21) =4845a(22) =3360a(23) =1350a(24) =300a(25) =30a(26) =21a(27) =210a(28) =1295a(29) =5880

External references