# A003926 (b-file synthesized from sequence entry)
1 720
2 3443212800
3 108051462804999168000
4 22246837484597339860644476682240000
5 30052178620241342579800569752518387643389968384000000
6 266350599470999830406351699267844906476060443517288646066593731706880000000