10462450355domain: NAppears in sequencesa(n) = 2^n + 3^n.at n=21A007689Centered cube numbers: (n+1)^21 + n^21.at n=2A036099Expansion of (1 - 3*x + x^2)/((1-2*x)*(1-3*x)).at n=22A085281a(n) = 2^(2*n+1) + 3^(2*n+1).at n=10A138233Integers nearest to (2^((n-3)/2) + 3^((n-3)/2)).at n=45A229194