# A083213 (b-file synthesized from sequence entry)
1 0
2 1
3 3
4 5
5 17
6 140
7 375
8 1090
9 11753
10 373581
11 1278347
12 13637279
13 163618153
14 27924949575
15 57188675627613
16 610029725544935
17 117122198574078151
18 19988890974450988558
19 239866235837773427391
20 12281151167363439030630