2945161

Appears in sequences

• a(n+2) = 3*a(n) - a(n-2) with a(0) = 1, a(1) = 3, a(2) = 6.at n=24A018186
• a(1)=3, a(2)=1, a(n) = 3*a(n-1) + a(n-2).at n=13A189735