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A007901 as a simple table

na(n)
10
20
30
40
54
622
798
8412
91700
106974
1128576
12117146
13480722
141974914
158122084
1633435390
17137757480
18567998152
192343472004
209674252070
2139956606552
22165099840920
23682446679582
242821858504062
2511671572244666
2648287711006032
27199822535773958
28827069530795224
293423890026639184
3014176516741276534

[0,0,0,0,4,22,98,412,1700,6974,28576,117146,
 480722,1974914,8122084,33435390,137757480,
 567998152,2343472004,9674252070,39956606552,
 165099840920,682446679582,2821858504062,
 11671572244666,48287711006032,199822535773958,
 827069530795224,3423890026639184,
 14176516741276534]