# A285868 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 20
4 126
5 962
6 8646
7 89546
8 1051350
9 13811642
10 200866326
11 3205348346
12 55704133590
13 1047489675962
14 21195507649686
15 459258707587706
16 10610386574074710
17 260385846630175802
18 6764666952807962646