6640981

Appears in sequences

• a(n) = 5*a(n-1) - 9*a(n-2) + 8*a(n-3) - 4*a(n-4), with a(0)=0, a(1)=0, a(2)=0, a(3)=1.at n=21A137221
• a(0) = 6; thereafter a(n) = 4*a(n-1) + 1.at n=10A323824