Generalized Fibonacci numbers: a(n) = a(n-1) + 10*a(n-2).

Terms

a(0) =1a(1) =1a(2) =11a(3) =21a(4) =131a(5) =341a(6) =1651a(7) =5061a(8) =21571a(9) =72181a(10) =287891a(11) =1009701a(12) =3888611a(13) =13985621a(14) =52871731a(15) =192727941a(16) =721445251a(17) =2648724661a(18) =9863177171a(19) =36350423781a(20) =134982195491a(21) =498486433301