# A013520 (b-file synthesized from sequence entry)
0 0
1 2
2 9
3 100
4 1237
5 18896
6 337663
7 6941194
8 161357425
9 4186540456
10 119942830785
11 3761004532550
12 128121728853479
13 4711881688294652
14 186065500280409423
15 7852240169544076190
16 352684377274345906213
17 16798134072300013751064