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A006611 as a simple table

na(n)
10
20
30
40
50
62
74
814
938
1089
11234
12581
131471
143560
158940
1621229
1752876
18126393
19309993

[0,0,0,0,0,2,4,14,38,89,234,581,1471,3560,8940,
 21229,52876,126393,309993]