466040domain: NAppears in sequencesa(n) = (1/9)(2^(n+3)-(-1)^n(3n-1)).at n=19A103196Expansion of (1-2x^2)/((1-2x)(1+x)^2).at n=21A113954Number of compositions of n if all summand runs are kept together.at n=30A274174Largest integer with sum of digits n in fractional base 4/3.at n=33A364779