login

A138551 as a simple table

na(n)
01
10
22
30
423
50
6684
70
834760
90
102493096
110
12228253267
130
1425091028820
150
163179942075960
170
18451649016238160
190
2070421753109861592
210
2211869050034269797984
230
242136758627313217104448
250

[1,0,2,0,23,0,684,0,34760,0,2493096,0,228253267,0,
 25091028820,0,3179942075960,0,451649016238160,0,
 70421753109861592,0,11869050034269797984,0,
 2136758627313217104448,0]