# A035609 (b-file synthesized from sequence entry)
0 1
1 40
2 800
3 10680
4 107200
5 864008
6 5831520
7 33940120
8 174074240
9 800061160
10 3340552608
11 12819218040
12 45663942720
13 152270990280
14 478683156960
15 1426865410392
16 4052167914240
17 11006991835560
18 28691971995680
19 71976895917880