1164228domain: NAppears in sequencesa(n) = T(2n,n), where T is the array defined in A025564.at n=9A025570a(n) = T(n,[ n/2 ]), where T is the array defined in A025564.at n=18A025575G.f.: 1/((1-x)*(1-x^2))^6.at n=17A038166G.f. A(x) satisfies A(x) = 1 + x^4*(1+x)*A(x)^2.at n=42A366589