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A006906 as a simple table

na(n)
01
11
23
36
414
525
656
797
8198
9354
10672
111170
122207
133762
146786
1511675
1620524
1734636
1860258
19100580
20171894
21285820
22480497
23791316
241321346
252156830
263557353
275783660
289452658
2915250216
3024771526
3139713788
3264011924
33102199026
34163583054
35259745051

[1,1,3,6,14,25,56,97,198,354,672,1170,2207,3762,
 6786,11675,20524,34636,60258,100580,171894,285820,
 480497,791316,1321346,2156830,3557353,5783660,
 9452658,15250216,24771526,39713788,64011924,
 102199026,163583054,259745051]