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A006772 as a simple table

na(n)
10
21
33
414
570
6370
72028
811452
966172
10389416
112326202
1214070268
1386010680
14530576780
153298906810
1620653559846
17130099026600
18823979294284
195244162058026
2033523117491920
21215150177410088
221385839069134800
238956173544332434
2458056703069399056
25377396656568011618
262459614847765495754
2716068572108927106202

[0,1,3,14,70,370,2028,11452,66172,389416,2326202,
 14070268,86010680,530576780,3298906810,
 20653559846,130099026600,823979294284,
 5244162058026,33523117491920,215150177410088,
 1385839069134800,8956173544332434,
 58056703069399056,377396656568011618,
 2459614847765495754,16068572108927106202]