# A068774 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 8
5 40
6 240
7 1120
8 4480
9 17280
10 65280
11 253440
12 1015808
13 4126720
14 16773120
15 67624960
16 270499840
17 1077903360
18 4294901760
19 17146183680
20 68585259008
21 274608947200
22 1099510579200
23 4400191897600
24 17600767590400
25 70385915658240
26 281474959933440