login

A147400 as a simple table

na(n)
11
21
31
41
51
63
77
815
929
10107
11505
122403
1311235
1468883
15550857
165140463
1752360741
18625116575
199135765233
20158905603757
213203687852735
2275422308943617

[1,1,1,1,1,3,7,15,29,107,505,2403,11235,68883,
 550857,5140463,52360741,625116575,9135765233,
 158905603757,3203687852735,75422308943617]