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A000075 as a simple table

na(n)
00
11
22
34
47
514
623
742
876
9139
10258
11482
12907
131717
143269
156257
1612020
1723171
1844762
1986683
20168233
21327053
22636837
231241723
242424228
254738426
269271299
2718157441
2835591647
2969820626
30137068908
31269270450
32529312241
331041093048
342048825748
354034059456

[0,1,2,4,7,14,23,42,76,139,258,482,907,1717,3269,
 6257,12020,23171,44762,86683,168233,327053,636837,
 1241723,2424228,4738426,9271299,18157441,35591647,
 69820626,137068908,269270450,529312241,1041093048,
 2048825748,4034059456]