# A063024 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 3 4 11 5 45 6 196 7 894 8 4215 9 20377 10 100463 11 503191 12 2553291 13 13097469 14 67808104 15 353851124 16 1859313324 17 9828998946 18 52237988523 19 278952216129 20 1495976545546 21 8053571710250 22 43507491045810 23 235784617161780