a(n+1) = 4*a(n) + 4*a(n-1) - 4*a(n-2) - a(n-3) with a(1)=1, a(2)=2, a(3)=11, a(4)=48.

A054894

a(n+1) = 4*a(n) + 4*a(n-1) - 4*a(n-2) - a(n-3) with a(1)=1, a(2)=2, a(3)=11, a(4)=48.

Terms

    a(0) =1a(1) =2a(2) =11a(3) =48a(4) =227a(5) =1054a(6) =4921a(7) =22944a(8) =107017a(9) =499106a(10) =2327795a(11) =10856592a(12) =50634107a(13) =236152510a(14) =1101392305a(15) =5136786240a(16) =23957470033a(17) =111735303362a(18) =521122556315

External references