191476224

Appears in sequences

• a(n) = Sum_{k=0..2n} (k+1) * A026519(n, k).at n=18A027266
• a(n) = Sum_{k=0..2n} (k+1)*T(n,k), where T is given by A026536.at n=18A027271
• a(n) = (2*n + 1)*6^n.at n=9A199299