11228332

Appears in sequences

• a(n) = a(n-1) + 3*a(n-2) for n > 1, a(0) = a(1) = 1.at n=20A006130
• a(n) = 3*a(n-2) - a(n-1) for n > 1, a(0) = 0, a(1) = 1.at n=21A182228