18635

Appears in sequences

• Values of Recamán's sequence A005132 at start of n-th segment (see A064492).at n=15A065038
• Matrix inverse of triangle A117334.at n=40A117335
• Numerator of (1^2/n + 2^2/(n-1) + ... + k^2/(n-k+1) + ... + (n-1)^2/2 + n^2/1).at n=8A119389
• Indices m such that A128646(m)-1 is prime, where A128646 = denominator of partial sums of 1/(p(i)-1).at n=59A137689
• Array read by antidiagonals: T(m,n) = number of dominating sets in the stacked prism graph C_m X P_n.at n=25A286514
• Number of unlabeled balanced rooted semi-identity trees with n nodes.at n=26A306201
• Partial sums of A108754.at n=40A307673
• Number of lattice 3-polytopes of width 3 and size n.at n=7A319962
• a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(i*j*k) / phi(k).at n=9A372662