Triangle read by rows: T(n,k) = n! * coefficient of m^k in the polynomial counting labeled digraphs with m nodes and n arcs and without directed paths of length >= 2, with 0 <= k <= 2*n.
A387663
Triangle read by rows: T(n,k) = n! * coefficient of m^k in the polynomial counting labeled digraphs with m nodes and n arcs and without directed paths of length >= 2, with 0 <= k <= 2*n.
Terms
- a(0) =0a(1) =0a(2) =-1a(3) =1a(4) =0a(5) =-2a(6) =5a(7) =-4a(8) =1a(9) =0a(10) =-24a(11) =62a(12) =-63a(13) =33a(14) =-9a(15) =1a(16) =0a(17) =-516a(18) =1522a(19) =-1830a(20) =1195a(21) =-470a(22) =114a(23) =-16a(24) =1a(25) =0a(26) =-19440a(27) =61764a(28) =-82610a(29) =62380
External references
- oeis: A387663