login

A007121 as a simple table

na(n)
01
10
20
36
4-12
540
6180
7-1512
811760
9-38880
1020160
112106720
12-22381920
13173197440
14-703999296
15-1737489600
1686030380800
17-1149696737280
1811455162974720
19-89560399541760
20636617260339200
21-6318191386644480
22139398889956480000
23-3797936822885990400

[1,0,0,6,-12,40,180,-1512,11760,-38880,20160,
 2106720,-22381920,173197440,-703999296,
 -1737489600,86030380800,-1149696737280,
 11455162974720,-89560399541760,636617260339200,
 -6318191386644480,139398889956480000,
 -3797936822885990400]