201643

Appears in sequences

• Number of symmetric, reduced unit interval schemes with n+1 intervals (n>=1).at n=27A005213
• Construct triangle in which n-th row is obtained by expanding (1 + x + x^2)^n and take the next-to-central column.at n=12A005717
• Irregular triangle read by rows: T(n,m) = number of lattice paths of type A^H terminating at point (n, m).at n=43A291081
• a(n) equals the coefficient of x^n in Sum_{m>=0} (x^m + 1 + 1/x^m)^m for n >= 1.at n=12A316591
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, formed inside a right triangle by the straight line segments mutually connecting all vertices and points on the two shorter edges whose positions equal the Farey series of order n.at n=39A359971