a(n) = (3*n-1) * 2^(n-2).

Terms

a(0) =1a(1) =5a(2) =16a(3) =44a(4) =112a(5) =272a(6) =640a(7) =1472a(8) =3328a(9) =7424a(10) =16384a(11) =35840a(12) =77824a(13) =167936a(14) =360448a(15) =770048a(16) =1638400a(17) =3473408a(18) =7340032a(19) =15466496a(20) =32505856a(21) =68157440a(22) =142606336a(23) =297795584a(24) =620756992a(25) =1291845632a(26) =2684354560a(27) =5570035712a(28) =11542724608a(29) =23890755584