login

A047762 as a simple table

na(n)
10
20
30
40
51
60
76
80
932
100
11176
120
13952
140
155302
160
1729960
180
19172536
200
211007575
220
235959656
240
2535622384
260
27214875104
280
291306303424
300
317995896502
320
3349236826080
340
35304799714960
360
371895785216039
380
3911841367945110
400
4174245791718824

[0,0,0,0,1,0,6,0,32,0,176,0,952,0,5302,0,29960,0,
 172536,0,1007575,0,5959656,0,35622384,0,214875104,
 0,1306303424,0,7995896502,0,49236826080,0,
 304799714960,0,1895785216039,0,11841367945110,0,
 74245791718824]