# A020128 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 3 4 9 5 42 6 232 7 1528 8 11611 9 99851 10 958562 11 10160756 12 117864769 13 1485096082 14 20197306709 15 294880677942 16 4600138575888 17 76362300359741 18 1343976486331426 19 24997962645764523 20 489960067856984639