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A056625 as a simple table

na(n)
21
34
422
5124
6726
74352
826614
9165204
101037672
116580424
1242062040
13270661328
141751614248
1511391756176
1674406502814
17487838450116
183209229661682
1921175301453040
20140097533633112
21929160187609096

[1,4,22,124,726,4352,26614,165204,1037672,6580424,
 42062040,270661328,1751614248,11391756176,
 74406502814,487838450116,3209229661682,
 21175301453040,140097533633112,929160187609096]