Triangular array read by rows. T(n,k) is the number of simple labeled graphs on n nodes with no isolated nodes and exactly k components. n >= 2, 1 <= k < n/2.
A218334
Triangular array read by rows. T(n,k) is the number of simple labeled graphs on n nodes with no isolated nodes and exactly k components. n >= 2, 1 <= k < n/2.
Terms
- a(0) =1a(1) =4a(2) =38a(3) =3a(4) =728a(5) =40a(6) =26704a(7) =730a(8) =15a(9) =1866256a(10) =20608a(11) =420a(12) =251548592a(13) =961324a(14) =12460a(15) =105a(16) =66296291072a(17) =79643424a(18) =484624a(19) =5040a(21) =12495365424a(22) =27712860a(23) =220500a(24) =945a(27) =2619965040a(28) =11297440a(29) =69300a(32) =458476648344a(33) =775542460a(34) =4192650
External references
- oeis: A218334