Triangular array read by rows. T(n,k) is the number of labeled digraphs (with self loops allowed) on [n] containing exactly k primitive components, n>=0, 0<=k<=n.
A365325
Triangular array read by rows. T(n,k) is the number of labeled digraphs (with self loops allowed) on [n] containing exactly k primitive components, n>=0, 0<=k<=n.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =4a(4) =9a(5) =3a(6) =51a(7) =298a(8) =138a(9) =25a(10) =1831a(11) =40815a(12) =17853a(13) =4494a(14) =543a(15) =166930a(16) =23752151a(17) =7418420a(18) =1861755a(19) =325895a(20) =29281a(21) =36681301a(22) =55427713806a(23) =10701675348a(24) =2105585760a(25) =391017795a(26) =53021223a(27) =3781503
External references
- oeis: A365325