Array read by antidiagonals: T(n,k) is the number of (planar) unlabeled asymmetric k-ary cacti having n polygons.

A303913

Array read by antidiagonals: T(n,k) is the number of (planar) unlabeled asymmetric k-ary cacti having n polygons.

Terms

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

External references