# A134709 (b-file synthesized from sequence entry) 1 0 2 1 3 7 4 31 5 2047 6 32767 7 131071 8 536870911 9 576460752303423487 10 154742504910672534362390527 11 40564819207303340847894502572031 12 42535295865117307932921825928971026431