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A268888 as a simple table

na(n)
10
220
384
4501
52190
69996
742362
8178400
9732378
102974934
1111933578
1247466417
13187325260
14734639334
152865135348
1611121381104
1742989239524
18165564387000
19635557701344
202432620417837
219286486715514
2235366757558512
23134400104565934

[0,20,84,501,2190,9996,42362,178400,732378,
 2974934,11933578,47466417,187325260,734639334,
 2865135348,11121381104,42989239524,165564387000,
 635557701344,2432620417837,9286486715514,
 35366757558512,134400104565934]