# A030898 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 26 5 134 6 809 7 5669 8 45353 9 408184 10 4081844 11 44900294 12 538803530 13 7004445892 14 98062242500 15 1470933637503 16 23534938200055 17 400093949400940 18 7201691089216926 19 136832130695121608 20 2736642613902432167