# A006904 (b-file synthesized from sequence entry) 4 1 5 1 6 4 7 5 8 14 9 23 10 52 11 97 12 202 13 395 14 800 15 1589 16 3190 17 6367 18 12748 19 25481 20 50978 21 101939 22 203896 23 407773 24 815566 25 1631111 26 3262244 27 6524465 28 13048954 29 26097883 30 52195792 31 104391557