# A098102 (b-file synthesized from sequence entry) 1 1 2 3 3 15 4 63 5 1023 6 4095 7 65535 8 262143 9 4194303 10 268435455 11 1073741823 12 68719476735 13 1099511627775 14 4398046511103 15 70368744177663 16 4503599627370495 17 288230376151711743 18 1152921504606846975