54417

Appears in sequences

• 11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.at n=33A007586
• a(n) = 1 + (1200 + (634 + (225 + (85 + (15 + n)*n)*n)*n)*n)*n/720.at n=16A145128
• E.g.f. cos(cos(x)-1) (even part).at n=6A192060
• Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 2.at n=23A245142
• Numbers k such that A075255(k) is the square of a prime.at n=33A386954