# A225573 (b-file synthesized from sequence entry)
0 0
1 2
2 12
3 90
4 864
5 10290
6 147456
7 2480058
8 48000000
9 1052307234
10 25798901760
11 699896958618
12 20826335158272
13 674680957031250
14 23643898043695104
15 891412022961534330
16 35982083287879778304
17 1548474957047229426498
18 70778880000000000000000