# A227866 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 27
4 64
5 3125
6 288
7 823543
8 147456
9 4251528
10 460800
11 285311670611
12 111974400
13 302875106592253
14 3251404800
15 13436928000
16 106542032486400
17 827240261886336764177
18 1053455155200000
19 1978419655660313589123979
20 102395841085440000