60517

Appears in sequences

• E.g.f. exp( x/(1 - x - x^2) ) / (1 - x - x^2).at n=6A080834
• Column 0 of the matrix 4th power of triangle A167015.at n=6A167144
• Triangle T(n,k), n>=0, 0<=k<=C(n,2), read by rows: T(n,k) = number of k-length chains in the poset of Dyck paths of semilength n ordered by inclusion.at n=21A193629
• Numbers of the form n^2 + 1 without prime divisors of the form a^2 + 1.at n=23A217279
• Löschian numbers (A003136) of the form k^2+1.at n=21A271184