# A378378 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 170
4 1920
5 22402
6 266800
7 3222634
8 39328768
9 483752258
10 5987236816
11 74474238698
12 930212870784
13 11659157743170
14 146567181170160
15 1847198697449770
16 23332153206562816
17 295286370825453442
18 3743540075432798608
19 47532529217041519658
20 604366048841146280320