6455520domain: NAppears in sequencesa(n) = f(a(n-1)), with f(m) = Sum i*b(i)*2^(i-1), m = Sum b(i)*2^i, and starting value 16.at n=9A007824Theta series of D_9 lattice.at n=20A008431p-INVERT of the positive integers, where p(S) = 1 - 8*S^2.at n=10A290915