53500

Appears in sequences

• Expansion of (1-x^5) / (1-x)^5.at n=40A008487
• 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=26A083930
• Count of interior bounded regions in a regular 2n-sided polygon dissected by all diagonals parallel to sides.at n=22A165217
• a(1)=0; for n>1, a(n) = 4*n^3 - 3*n^2 - 3*n + 4.at n=23A296363
• a(n) is the number of fixed polyglasses (polyiamonds which need only touch at corners) with n cells.at n=5A319324