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A000991 as a simple table

na(n)
01
11
23
36
412
521
640
767
8117
9193
10319
11510
12818
131274
141983
153032
164610
176915
1810324
1915235
2022371
2132554
2247119
2367689
2496763
25137404
26194211
27272939
28381872
29531576
30736923
311016904
321397853
331913561
342610023
353546507
364802694
376481101
388718309
3911689929
4015627591
4120828892

[1,1,3,6,12,21,40,67,117,193,319,510,818,1274,
 1983,3032,4610,6915,10324,15235,22371,32554,47119,
 67689,96763,137404,194211,272939,381872,531576,
 736923,1016904,1397853,1913561,2610023,3546507,
 4802694,6481101,8718309,11689929,15627591,
 20828892]