# A128327 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 20
4 114
5 712
6 4772
7 33896
8 253102
9 1975610
10 16054568
11 135413280
12 1182664740
13 10675334958
14 99437919664
15 954581258020
16 9433732288486
17 95883201181772
18 1001411775057322
19 10738668800872594
20 118151145186400408