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A006765 as a simple table

na(n)
10
20
31
44
511
634
7107
8368
91284
104654
1117072
1263599
13238590
14901970
153426575
1613079254
1750107908
18192622051
19742624231
202870671949
2111123060677
2243191857687
23168047007727
24654999700402
252557227044763
269999088822074
2739153010938486
28153511100594602
29602621953061977
302368347037571251
319317706529987949
3236695016991712878

[0,0,1,4,11,34,107,368,1284,4654,17072,63599,
 238590,901970,3426575,13079254,50107908,192622051,
 742624231,2870671949,11123060677,43191857687,
 168047007727,654999700402,2557227044763,
 9999088822074,39153010938486,153511100594602,
 602621953061977,2368347037571251,9317706529987949,
 36695016991712878]