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A178706 as a simple table

na(n)
10
21
36
422
570
6215
7652
81964
95900
1017709
1153138
12159426
13478290
141434883
154304664
1612914008
1738742040
18116226137
19348678430
201046035310
213138105950
229414317871
2328242953636
2484728860932
25254186582820

[0,1,6,22,70,215,652,1964,5900,17709,53138,159426,
 478290,1434883,4304664,12914008,38742040,
 116226137,348678430,1046035310,3138105950,
 9414317871,28242953636,84728860932,254186582820]