# A261862 (b-file synthesized from sequence entry) 1 3 2 7 3 31 4 73 5 85 6 127 7 2047 8 3133 9 4369 10 8191 11 11275 12 49981 13 60787 14 76627 15 121369 16 131071 17 140911 18 178481 19 262657 20 486737 21 524287 22 599479 23 1082401