# A053623 (b-file synthesized from sequence entry) 1 1 2 2 3 4 4 14 5 38 6 126 7 252 8 1662 9 7180 10 39430 11 111064 12 803876 13 2863992 14 12123360 15 24246720 16 329012784 17 2602608516