# A006778 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 15 5 31 6 59 7 110 8 198 9 347 10 592 11 997 12 1641 13 2666 14 4266 15 6741 16 10525 17 16268 18 24882 19 37717 20 56683 21 84504 22 125031 23 183716 24 268125 25 388873 26 560647 27 803723 28 1146013 29 1625731 30 2294964 31 3224588 32 4510552 33 6282295 34 8714035 35 12039319 36 16570278 37 22723025