# A000675 (b-file synthesized from sequence entry) 0 1 1 1 2 0 3 1 4 1 5 1 6 2 7 4 8 5 9 10 10 19 11 36 12 68 13 138 14 277 15 581 16 1218 17 2591 18 5545 19 12026 20 26226 21 57719 22 127685 23 284109 24 634919 25 1425516 26 3212890 27 7269605 28 16504439 29 37592604 30 85876345 31 196717882 32 451768247 33 1039990913 34 2399476030 35 5547849750