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A059840 as a simple table

na(n)
10
20
32
45
515
639
7104
8272
9714
101869
114895
1212815
1333552
1487840
15229970
16602069
171576239
184126647
1910803704
2028284464
2174049690
22193864605
23507544127
241328767775
253478759200
269107509824
2723843770274
2862423800997
29163427632719

[0,0,2,5,15,39,104,272,714,1869,4895,12815,33552,
 87840,229970,602069,1576239,4126647,10803704,
 28284464,74049690,193864605,507544127,1328767775,
 3478759200,9107509824,23843770274,62423800997,
 163427632719]