Define a(1)=0, a(2)=2 then a(n) = 3*a(n-1) - a(n-2), a(n+1) = 3*a(n)-a(n-1) and a(n+2) = 3*a(n+1) - a(n) + 2.

A105073

Define a(1)=0, a(2)=2 then a(n) = 3*a(n-1) - a(n-2), a(n+1) = 3*a(n)-a(n-1) and a(n+2) = 3*a(n+1) - a(n) + 2.

Terms

    a(0) =0a(1) =2a(2) =6a(3) =16a(4) =44a(5) =116a(6) =304a(7) =798a(8) =2090a(9) =5472a(10) =14328a(11) =37512a(12) =98208a(13) =257114a(14) =673134a(15) =1762288a(16) =4613732a(17) =12078908a(18) =31622992a(19) =82790070a(20) =216747218a(21) =567451584a(22) =1485607536a(23) =3889371024a(24) =10182505536a(25) =26658145586a(26) =69791931222a(27) =182717648080a(28) =478361013020

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