Forests of k increasing plane unary-binary trees on n nodes. Generalized Stirling numbers of the second kind associated with A185415.
A185422
Forests of k increasing plane unary-binary trees on n nodes. Generalized Stirling numbers of the second kind associated with A185415.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =3a(5) =1a(6) =9a(7) =15a(8) =6a(9) =1a(10) =39a(11) =75a(12) =45a(13) =10a(14) =1a(15) =189a(16) =459a(17) =330a(18) =105a(19) =15a(20) =1a(21) =1107a(22) =3087a(23) =2709a(24) =1050a(25) =210a(26) =21a(27) =1a(28) =7281a(29) =23535
External references
- oeis: A185422