74261domain: NAppears in sequencesConvolution of Fibonacci numbers and composite numbers.at n=18A023609a(n)= 3*a(n-3) +3*a(n-6) +a(n-9).at n=24A109530G.f. A(x) = Sum_{n>=0} A_{2*n}(x)^(n+1) where A_{n+1}(x) = A_n(A(x)) with A_0(x)=x and A(0)=0.at n=6A232685Expansion of Product_{k>=1} 1/(1 - x^(2*k - 1))^(k^2).at n=22A294750