login

A109714 as a simple table

na(n)
11
21
33
418
5120
61170
712600
8176400
92608200
1046607400
11883159200
1219429502400
13447567120000
1411629447830000
15316028116404000
169516436753824000
17297478346845680000
1810151626256147376000
19359237701318479984000
2013733349319337487840000
21542212802070902202240000

[1,1,3,18,120,1170,12600,176400,2608200,46607400,
 883159200,19429502400,447567120000,11629447830000,
 316028116404000,9516436753824000,
 297478346845680000,10151626256147376000,
 359237701318479984000,13733349319337487840000,
 542212802070902202240000]