# A318432 (b-file synthesized from sequence entry)
0 1
1 4
2 12
3 76
4 460
5 3104
6 22404
7 169152
8 1315020
9 10460416
10 84764512
11 697212652
12 5805722692
13 48847196896
14 414623627136
15 3546272614976
16 30532934225100
17 264420681260336
18 2301782759539392
19 20129523771781288
20 176765807152990560
21 1558058796052048968