Triangle read by rows: T(n,k) is the number of hex trees with n edges and k pairs of adjacent vertices of outdegree 2.
A126188
Triangle read by rows: T(n,k) is the number of hex trees with n edges and k pairs of adjacent vertices of outdegree 2.
Terms
- a(0) =1a(1) =3a(2) =10a(3) =36a(4) =135a(5) =2a(6) =519a(7) =24a(8) =2034a(9) =180a(10) =5a(11) =8100a(12) =1110a(13) =75a(14) =32688a(15) =6210a(16) =675a(17) =14a(18) =133380a(19) =32886a(20) =4851a(21) =252a(22) =549342a(23) =168210a(24) =30996a(25) =2646a(26) =42a(27) =2280690a(28) =840132a(29) =184842
External references
- oeis: A126188