120204domain: NAppears in sequencesSum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026648.at n=23A026658Numbers n such that n and n^4 are sums of two twin primes.at n=18A212430Numbers k such that both k and k^2 are sums of a twin prime pair.at n=20A213784a(n) is the total area of all closed Deutsch paths of length n.at n=10A330169