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A149920 as a simple table

na(n)
01
12
25
315
447
5157
6556
72019
87584
929152
10113984
11453620
121829076
137459678
1430755525
15127897631
16536170959
172264041183
189619849541
1941113706454
20176630946692
21762409276043
223305293076682
2314386354109668
2462846284893256
25275475587203370
261211274147573245
275341553425781988

[1,2,5,15,47,157,556,2019,7584,29152,113984,
 453620,1829076,7459678,30755525,127897631,
 536170959,2264041183,9619849541,41113706454,
 176630946692,762409276043,3305293076682,
 14386354109668,62846284893256,275475587203370,
 1211274147573245,5341553425781988]