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A005028 as a simple table

na(n)
31
42
54
612
733
8102
9312
101010
113256
1210836
1336094
14122544
15417150
161437712
174970904
1817333772
1960638124
20213435264
21753520804
222672606464
239505230397
2433928264990
25121400935184
26435660446342
271566809204928
285648450745204
2920402191885146
3073842311224632

[1,2,4,12,33,102,312,1010,3256,10836,36094,122544,
 417150,1437712,4970904,17333772,60638124,
 213435264,753520804,2672606464,9505230397,
 33928264990,121400935184,435660446342,
 1566809204928,5648450745204,20402191885146,
 73842311224632]