# A356530 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 18
4 156
5 1020
6 23040
7 189000
8 8462160
9 174741840
10 8418513600
11 110288455200
12 26670240273600
13 364684824504000
14 46300470369753600
15 5169242034644688000
16 359472799348030368000
17 7508907247291081632000
18 6157317530690533823616000