67640

Appears in sequences

• a(n) = A027052(n, 2n-3).at n=11A027059
• Greatest number in row n of array T given by A027052.at n=13A027071
• a(n) = Sum_{k=0..n-1} T(n,k)*T(n,k+1), T given by A026736.at n=8A027216
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 13.at n=21A031691
• a(n) = 169*n^2 + 2*n.at n=19A158220
• a(n) = Sum_{k=0..n} r_4(k^2 + 1), where r_4(k) is the number of ways of writing k as a sum of 4 squares (A000118).at n=26A333174