# A001660 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 36
5 876
6 408696
7 83762796636
8 3508125906207095591916
9 6153473687096578758445014683368786661634996
10 18932619208894981833333582059033329370801260096062214926751788496235698477988081702676