414728

Appears in sequences

• a(n) = 4*a(n-1) -3*a(n-2) -2*a(n-3) +a(n-4), n>8.at n=16A108140
• 4 times the Lucas number A000032(n).at n=24A156279
• Number of overpal-free binary words of length n.at n=47A277277