a(n) = 4*a(n-1) - 6*a(n-2), with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =4a(3) =10a(4) =16a(5) =4a(6) =-80a(7) =-344a(8) =-896a(9) =-1520a(10) =-704a(11) =6304a(12) =29440a(13) =79936a(14) =143104a(15) =92800a(16) =-487424a(17) =-2506496a(18) =-7101440a(19) =-13366784a(20) =-10858496a(21) =36766720a(22) =212217856a(23) =628271104a(24) =1239777280a(25) =1189482496a(26) =-2680733696a(27) =-17859829760a(28) =-55354916864a(29) =-114260688896