448980domain: NAppears in sequencesa(n) = C(n-2,2)+C(n-5,5)+...+C(n-(3*floor((n-3)/3)+2),3*floor((n-3)/3)+2).at n=30A101551p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S^3.at n=30A291217Expansion of (1 + x)/(1 - x^3*(1 + x)^3).at n=29A375319