3728269

Appears in sequences

• a(n) = 3*A131666(n) - A131666(n+1).at n=25A135259
• Last number in row n of triangle A199636.at n=21A199638
• Numbers of the form (2^(2*j + 6*k + 5) - 2^(2*j + 1) - 3)/9, with j,k >= 0.at n=25A342815