# A186893 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 11 5 31 6 59 7 127 8 251 9 377 10 433 11 1019 12 1969 13 2047 14 3449 15 4091 16 8191 17 11327 18 15737 19 16379 20 32689 21 36737 22 64889 23 65531