65891domain: NAppears in sequencesa(n) = T(2n-1,n-1), T given by A026703.at n=7A026707T(n,[ n/2 ]), T given by A026703.at n=15A026709Number of catafusenes with C_{2v}(b) symmetry (see reference for precise definition).at n=9A045908Numbers that are the sum of seven fourth powers in exactly ten ways.at n=25A345832