1672704domain: NAppears in sequencesHalf totient of 2^n+1.at n=21A063474E.g.f. satisfies: A'(x) = 1 + x*A(x)^3 where A(0) = 1.at n=9A144013Triangle read by rows: T(n,k) = n^3*k^3*(n+k)^2, n>=0, 0 <= k <= n.at n=39A358294Triangle read by rows: T(n,k) = n^3*k^3*(n+k)^2, n>=1, 1 <= k <= n.at n=30A358295