# A068777 (b-file synthesized from sequence entry)
1 0
2 2
3 6
4 24
5 80
6 240
7 896
8 3584
9 15360
10 65792
11 270336
12 1081344
13 4259840
14 16773120
15 66584576
16 266338304
17 1069547520
18 4295032832
19 17213423616
20 68853694464
21 275146342400
22 1099510579200
23 4395899027456
24 17583596109824
25 70351564308480
26 281474993487872