# A168407 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 712
4 91920
5 44874784
6 85939843136
7 660213878210688
8 20540390859740217600
9 2592165941692975372042752
10 1324271564605167892188248409088
11 2730585827960928853182474922961668096