login

A221194 as a simple table

na(n)
01
12
21
360
41
5242
61
73840
81
915122
101
11238140
121
13937442
141
1514760960
161
1758106402
181
19914941500
201
213601659602
221
2356711612160
241
25223244789042
261
273515205012540
281
2913837575261122
301
31217885999165440
321
33857706421400642
341
3513505416743244860
361

[1,2,1,60,1,242,1,3840,1,15122,1,238140,1,937442,
 1,14760960,1,58106402,1,914941500,1,3601659602,1,
 56711612160,1,223244789042,1,3515205012540,1,
 13837575261122,1,217885999165440,1,
 857706421400642,1,13505416743244860,1]