# A014340 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 0
4 24
5 240
6 2040
7 15120
8 106680
9 726768
10 4861560
11 32126160
12 210749880
13 1375923120
14 8955795576
15 58177326480
16 377439735480
17 2446686537840
18 15851581501560
19 102662600100432
20 664738663537080