330650

Appears in sequences

• Number of key permutations of length n: permutations {a_i} with |a_i - a_{i-1}| = 1 or 2.at n=29A003274
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 46.at n=24A031724
• a(n) = 625*n^2 + 25.at n=22A157915