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A000067 as a simple table

na(n)
01
12
24
36
410
518
633
760
8111
9205
10385
11725
121374
132610
144993
159578
1618426
1735568
1868806
19133411
20259145
21504222
22982538
231917190
243745385
257324822
2614339072
2728095711
2855095559
29108124461
30212342327
31417283564
32820520378
331614331755
343177789615
356258525127

[1,2,4,6,10,18,33,60,111,205,385,725,1374,2610,
 4993,9578,18426,35568,68806,133411,259145,504222,
 982538,1917190,3745385,7324822,14339072,28095711,
 55095559,108124461,212342327,417283564,820520378,
 1614331755,3177789615,6258525127]