# A001797 (b-file synthesized from sequence entry) 1 2 2 20 3 110 4 2600 5 16150 6 208012 7 1376550 8 74437200 9 511755750 10 7134913500 11 50315410002 12 1433226830360 13 10292051290430 14 148889972762300 15 1083802983548950 16 126935005433253024 17 933787075442258310 18 13799767368300523260