1269789696

Appears in sequences

• a(n) = Sum_{k=0..2n} (k+1) * A026519(n, k).at n=20A027266
• a(n) = Sum_{k=0..2n} (k+1)*T(n,k), where T is given by A026536.at n=20A027271
• a(n) = k, where k/(product of digits of k) is least possible integer for k with n digits.at n=9A034686
• Number of periodic palindromes using a maximum of six different symbols.at n=21A056488
• a(n) = (2*n + 1)*6^n.at n=10A199299
• Numbers k such that A007954(k) divides k and k divides A007954(k)^2.at n=32A257554