# A177574 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 90
4 2520
5 113400
6 7479361
7 679851145
8 81464937000
9 12443633129640
10 2360051647753800
11 544135452733303200
12 149883590538452902825
13 48612505145280415315705
14 18337020151083296373118050
15 7959571454218402191668618850
16 3939389912325851696444898536160