Triangular array read by rows: T(n,k) is the number of simple labeled graphs with n vertices and k components such that each vertex has even degree; n >= 1, 1 <= k <= n.
A228550
Triangular array read by rows: T(n,k) is the number of simple labeled graphs with n vertices and k components such that each vertex has even degree; n >= 1, 1 <= k <= n.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =3a(7) =4a(8) =0a(9) =1a(10) =38a(11) =15a(12) =10a(13) =0a(14) =1a(15) =720a(16) =238a(17) =45a(18) =20a(19) =0a(20) =1a(21) =26614a(22) =5145a(23) =868a(24) =105a(25) =35a(26) =0a(27) =1a(28) =1858122a(29) =215355
External references
- oeis: A228550