Generalized Fibonacci numbers: a(n) = a(n-1) + 9*a(n-2).

Terms

a(0) =1a(1) =1a(2) =10a(3) =19a(4) =109a(5) =280a(6) =1261a(7) =3781a(8) =15130a(9) =49159a(10) =185329a(11) =627760a(12) =2295721a(13) =7945561a(14) =28607050a(15) =100117099a(16) =357580549a(17) =1258634440a(18) =4476859381a(19) =15804569341a(20) =56096303770a(21) =198337427839a(22) =703204161769