# A263417 (b-file synthesized from sequence entry)
0 1
1 2
2 20
3 1600
4 1408000
5 17346560000
6 3633063526400000
7 15218176499384320000000
8 1466155647574283911168000000000
9 3672576800382377947366110003200000000000
10 266783946802402043703868836144710942720000000000000