Ordered forests of k increasing unordered trees on the vertex set {1,2,...,n} in which all outdegrees are <= 2.
A185421
Ordered forests of k increasing unordered trees on the vertex set {1,2,...,n} in which all outdegrees are <= 2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =2a(4) =6a(5) =6a(6) =5a(7) =22a(8) =36a(9) =24a(10) =16a(11) =90a(12) =210a(13) =240a(14) =120a(15) =61a(16) =422a(17) =1260a(18) =2040a(19) =1800a(20) =720a(21) =272a(22) =2226a(23) =8106a(24) =16800a(25) =21000a(26) =15120a(27) =5040a(28) =1385a(29) =13102
External references
- oeis: A185421