# A037518 (b-file synthesized from sequence entry)
1 2
2 18
3 163
4 1469
5 13221
6 118990
7 1070912
8 9638208
9 86743873
10 780694859
11 7026253731
12 63236283580
13 569126552222
14 5122138969998
15 46099250729983
16 414893256569849
17 3734039309128641
18 33606353782157770
19 302457184039419932
20 2722114656354779388