274969domain: NAppears in sequencesa(n) = Sum_{k=0..n} C(n-k,3k).at n=23A003522Base 8 digits are, in order, the first n terms of the periodic sequence with initial period 1,0,3.at n=6A037594Expansion of x/(1 - 2*x^2 - x^3 + x^4).at n=34A122514p-INVERT of (1,1,1,1,1,...), where p(S) = 1 - S^3 - S^4.at n=17A290998