# A254381 (b-file synthesized from sequence entry)
0 1
1 18
2 540
3 22680
4 1224720
5 80831520
6 6304858560
7 567437270400
8 57878601580800
9 6598160580211200
10 831368233106611200
11 114728816168712345600
12 17209322425306851840000
13 2787910232899709998080000
14 485096380524549539665920000
15 90227926777566214377861120000