# A275653 (b-file synthesized from sequence entry)
0 1
1 18
2 1050
3 77616
4 6370650
5 554822268
6 50199951984
7 4664758248000
8 442077195513690
9 42533571002422500
10 4141601026094832300
11 407220411993767798400
12 40363606408574136870000
13 4028061310168832261158176
14 404311537318239680601595200
15 40785601782042745410592271616