a(n) = 7*a(n-1) - 3*a(n-2), with a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =7a(3) =46a(4) =301a(5) =1969a(6) =12880a(7) =84253a(8) =551131a(9) =3605158a(10) =23582713a(11) =154263517a(12) =1009096480a(13) =6600884809a(14) =43178904223a(15) =282449675134