# A306266 (b-file synthesized from sequence entry)
1 1
2 2
3 54
4 6480
5 2268000
6 1837080000
7 2970558360000
8 8650265944320000
9 42040292489395200000
10 321608237543873280000000
11 3696886690566823353600000000
12 61486619437507406017075200000000
13 1433990938521547723130227814400000000