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A128231 as a simple table

na(n)
01
11
21
32
45
511
641
7176
8617
93445
1021121
11101806
12757901
136040607
1437057385
15344844956
163382739921
1725199021801
18281393484097
193277874983450
2028726884853141
21374253333849011
225047927474513001
2350875313074912712

[1,1,1,2,5,11,41,176,617,3445,21121,101806,757901,
 6040607,37057385,344844956,3382739921,25199021801,
 281393484097,3277874983450,28726884853141,
 374253333849011,5047927474513001,
 50875313074912712]