56394

Appears in sequences

• Map from binary trees of size n to the set of corresponding trivalent plane trees (tpt) represented as size 2n+1 general trees.at n=34A083930
• a(n) = n * (10*n^2 - 6n + 1) = n * A087348(n).at n=18A104099
• Number of nonnesting permutations of the multiset {1,1,2,2,...,n,n} that avoid 123.at n=7A382361