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A247772 as a simple table

na(n)
01
11
25
339
4369
52908
619185
7137200
81022915
97606043
1055699672
11405617356
122969215193
1321791407596
14159806458014
151170659384512
168574740528977
1762830753812692
18460445907547463
193374031670320652
2024722398637797408
21181148733466258107
221327366881461315358

[1,1,5,39,369,2908,19185,137200,1022915,7606043,
 55699672,405617356,2969215193,21791407596,
 159806458014,1170659384512,8574740528977,
 62830753812692,460445907547463,3374031670320652,
 24722398637797408,181148733466258107,
 1327366881461315358]