126965305501domain: NAppears in sequencesExpansion of 1/((1-9x)(1-11x)).at n=10A016190For n even a(n) = a(n-1) + 10*a(n-2), for n odd a(n) = a(n-3) + 10 a(n-2); with a(1) = 0, a(2) = 1.at n=22A161999