# A024947 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 3 5 3 6 12 7 21 8 30 9 66 10 138 11 264 12 525 13 1029 14 2460 15 5079 16 10344 17 22197 18 50421 19 108966 20 229827 21 498432 22 1136190 23 2495118 24 5390319 25 11879355 26 27012990 27 60008826 28 131877372 29 292070991 30 670433502 31 1500384540 32 3327218859 33 7449719727 34 17089051899