# A037644 (b-file synthesized from sequence entry)
1 2
2 21
3 190
4 1712
5 15411
6 138700
7 1248302
8 11234721
9 101112490
10 910012412
11 8190111711
12 73711005400
13 663399048602
14 5970591437421
15 53735322936790
16 483617906431112
17 4352561157880011
18 39173050420920100
19 352557453788280902
20 3173017084094528121