25256

Appears in sequences

• Generalized sum of divisors function: third diagonal of A060047.at n=37A060046
• Numbers n such that 2*10^n+11 is prime.at n=18A086865
• Triangle read by rows: row n is the first row of the matrix M[n]^(n-1), where M[n] is the n X n tridiagonal matrix with main diagonal (2,3,3,...) and super- and subdiagonals (1,1,1,...).at n=38A124733
• Partial sums of A006000.at n=20A133252
• Number of unlabeled marked rooted trees with n nodes.at n=5A136794
• Molecular topological indices of the gear graphs.at n=27A192827
• G.f. satisfies: A(x) = (x + A(A(x)))^2 where g.f. A(x) = Sum_{n>=1} a(n)*x^(3*n-1).at n=6A212392
• Number of even parts in the partitions of n into 10 parts.at n=43A309662
• Number of integer partitions of n that contain at least one even part and whose halved even parts are relatively prime.at n=39A366845
• Number of permutations of order n avoiding consecutive pattern 121'3.at n=8A376694
• Array A(T,k) read down antidiagonals: Number of typed decorated trees of cardinality T on k vertices with D=2 decorations.at n=22A384867