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A181984 as a simple table

na(n)
01
12
25
312
428
565
6151
7351
8816
91897
104410
1110252
1223833
1355405
14128801
15299426
16696081
171618192
183761840
198745217
2020330163
2147261895
22109870576
23255418101
24593775046
251380359512
263208946545
277459895657
2817342153393
2940315615410
3093722435101

[1,2,5,12,28,65,151,351,816,1897,4410,10252,23833,
 55405,128801,299426,696081,1618192,3761840,
 8745217,20330163,47261895,109870576,255418101,
 593775046,1380359512,3208946545,7459895657,
 17342153393,40315615410,93722435101]