# A012509 (b-file synthesized from sequence entry)
0 0
1 2
2 4
3 32
4 544
5 15872
6 707584
7 44736512
8 3807514624
9 419730685952
10 58177770225664
11 9902996106248192
12 2030847773013704704
13 493842960380415967232
14 140503203207887919775744
15 46238368375619195682947072
16 17427925514250338592341622784
17 7458815407441059142195019251712