# A018183 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 12 5 24 6 45 7 85 8 161 9 305 10 576 11 1087 12 2053 13 3877 14 7321 15 13824 16 26102 17 49285 18 93059 19 175712 20 331776 21 626451 22 1182849 23 2233426 24 4217100 25 7962624 26 15034827 27 28388386 28 53602241 29 101210414 30 191102976