# A291902 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 18
4 360
5 14460
6 994680
7 109021500
8 17815754880
9 4147063256448
10 1323985303267200
11 562636176102554400
12 310405397451855552000
13 217731000904433587359360
14 190749857434239995742090240
15 205540893695782384696324368000
16 268793206446238988670401236992000