572548domain: NAppears in sequencesG.f.: A(x) = 1/(1 - x*B(x^2)), where B(x) = Sum_{n>=0} a(n)^2*x^n is the g.f. of A121648.at n=24A121649A bisection of A121649; a(n) = A121649(2*n) = A121648(2*n)^(1/2).at n=12A121650Successive differences of A000990.at n=41A147766