# A154000 (b-file synthesized from sequence entry) 0 1 1 2 2 2 3 4 4 16 5 31 6 126 7 1009 8 3933 9 31428 10 512187 11 4017316 12 64213559 13 2090787507 14 32776879657 15 1046731134966 16 68125822829775 17 2134091162950790 18 136215005250379929 19 17716724971218816648 20 1109196056459852373561