Triangle read by rows: T(n,k) is the number of semi-regular relations on n nodes with each node having out-degree k (0 <= k <= n).

A259471

Triangle read by rows: T(n,k) is the number of semi-regular relations on n nodes with each node having out-degree k (0 <= k <= n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =7a(8) =7a(9) =1a(10) =1a(11) =19a(12) =66a(13) =19a(14) =1a(15) =1a(16) =47a(17) =916a(18) =916a(19) =47a(20) =1a(21) =1a(22) =130a(23) =16816a(24) =91212a(25) =16816a(26) =130a(27) =1a(28) =1a(29) =343

External references