Regular triangle where T(n,k) is the number of enriched p-trees of weight n with k leaves.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =2a(8) =4a(9) =5a(10) =1a(11) =2a(12) =6a(13) =11a(14) =12a(15) =1a(16) =3a(17) =10a(18) =26a(19) =38a(20) =34a(21) =1a(22) =3a(23) =13a(24) =39a(25) =87a(26) =117a(27) =92a(28) =1a(29) =4