277365domain: NAppears in sequencesa(n) = (F(3n) + F(n))/3, where F = A000045 (the Fibonacci sequence).at n=10A049673Expansion of e.g.f. 1/(1 - x^3/6 * (exp(x) - 1)).at n=11A353999Expansion of e.g.f. -LambertW(x^3/6 * (1 - exp(x))).at n=11A355308