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A261840 as a simple table

na(n)
01
12
23
316
421
550
6205
7292
8587
91110
104535
115980
1212447
1320910
1440195
15142520
16196291
17372042
18635081
191128872
201873245
216537466
228553639
2316333532
2426470861
2546629886
2673222631
27127947300
28385293581
29518212198
30939401193
311516760160
322564361235

[1,2,3,16,21,50,205,292,587,1110,4535,5980,12447,
 20910,40195,142520,196291,372042,635081,1128872,
 1873245,6537466,8553639,16333532,26470861,
 46629886,73222631,127947300,385293581,518212198,
 939401193,1516760160,2564361235]