a(n) = 3*a(n-1) + 4*a(n-2), with a(0) = 3, a(1) = 7, a(3) = 9, for n > 2.

A115164

a(n) = 3*a(n-1) + 4*a(n-2), with a(0) = 3, a(1) = 7, a(3) = 9, for n > 2.

Terms

    a(0) =3a(1) =7a(2) =9a(3) =55a(4) =201a(5) =823a(6) =3273a(7) =13111a(8) =52425a(9) =209719a(10) =838857a(11) =3355447a(12) =13421769a(13) =53687095a(14) =214748361a(15) =858993463a(16) =3435973833a(17) =13743895351a(18) =54975581385a(19) =219902325559a(20) =879609302217

External references