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A056288 as a simple table

na(n)
10
20
32
49
530
689
7258
8720
92016
105583
1115546
1243215
13120750
14338001
15950030
162677770
177573350
1821478632
1961088874
20174179133
21497812378
221425832077
234092087522
2411765778330
2533887517840
2697756266615
27282414622728
28816999371955
292366509198350
306862929885407

[0,0,2,9,30,89,258,720,2016,5583,15546,43215,
 120750,338001,950030,2677770,7573350,21478632,
 61088874,174179133,497812378,1425832077,
 4092087522,11765778330,33887517840,97756266615,
 282414622728,816999371955,2366509198350,
 6862929885407]