314296

Appears in sequences

• Expansion of x*(x^3+3*x^2-1)*(5*x^4-5*x^2+1) / ( -1+x+8*x^2-7*x^3-21*x^4+15*x^5+20*x^6-10*x^7-5*x^8+x^9 ).at n=24A122604
• Chebyshev polynomial of the second kind U(3,n).at n=34A144138
• a(n) is the total number of down steps between the 3rd and 4th up steps in all 2-Dyck paths of length 3*n.at n=9A334641