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A007721 as a simple table

na(n)
11
21
32
46
519
668
7236
8863
93137
1011636
1143306
12162728
13614142
142330454
158875656
1633924699
17130038017
18499753560
191924912505
207429159770
2128723877046
22111236422377
23431403469046
241675316533812
256513837677642
2625354842098354
2798794053266471
28385312558567775

[1,1,2,6,19,68,236,863,3137,11636,43306,162728,
 614142,2330454,8875656,33924699,130038017,
 499753560,1924912505,7429159770,28723877046,
 111236422377,431403469046,1675316533812,
 6513837677642,25354842098354,98794053266471,
 385312558567775]