137728domain: NAppears in sequencesCatalan-Larcombe-French sequence.at n=5A053175Number of (undirected) Hamiltonian paths in the n-Sierpinski carpet graph.at n=1A308138Integers x such that there exist four integers 0<y<=z<=t<=w such that psi(x)^4 = x^4 + y^4 + z^4 + t^4 + w^4.at n=3A391536