# A053014 (b-file synthesized from sequence entry)
1 1
2 30
3 60
4 840
5 10080
6 110880
7 1441440
8 15135120
9 21162960
10 21162960
11 232792560
12 26771144400
13 26771144400
14 2730656728800
15 30278164316400
16 33977306563200
17 38000934972000
18 3610088822340000
19 37400520199442400
20 390033996365613600
21 438120379479182400
22 4505020423775071200