# A293567 (b-file synthesized from sequence entry)
0 1
1 0
2 -2
3 0
4 12
5 -120
6 -120
7 5040
8 -38640
9 -181440
10 5412960
11 -33264000
12 -478336320
13 12194582400
14 -50871300480
15 -2168559993600
16 49692144902400
17 -59775248332800
18 -15819216007795200
19 329479616206540800
20 1101564635255884800
21 -174845824790757120000