# A012418 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 6 4 21 5 100 6 1005 7 9170 8 73353 9 794952 10 11042745 11 144625118 12 1936131549 13 31475441452 14 562265168101 15 9960214270890 16 187956163443857 17 3970728871687824 18 88040662078595313 19 1994667867977462454