# A023943 (b-file synthesized from sequence entry)
0 1
1 0
2 27720
3 1272320
4 19707450
5 163430400
6 927305904
7 3995658240
8 14261752680
9 43493359616
10 118805241072
11 292653344256
12 671496501200
13 1430857236480
14 2904257385888
15 5571801102336
16 10326899016378
17 18297213419520