# A028447 (b-file synthesized from sequence entry)
0 1
1 3
2 32
3 229
4 1845
5 14320
6 112485
7 880163
8 6895792
9 54003765
10 422983905
11 3312866080
12 25947198337
13 203223953179
14 1591695681488
15 12466511517581
16 97640484615909
17 764741896529104
18 5989627994067061
19 46912093390144139
20 367425909133064576
21 2877761124002870925