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A018012 as a simple table

na(n)
01
12
25
313
430
571
6169
7397
8934
92197
105165
1112146
1228561
1367156
14157907
15371293
16873034
172052795
184826809
1911349443
2026686340
2162748517
22147542764
23346922420
24815730721
251918055940
264509991465
2710604499373
2824934727221
2958629889045
30137858491849

[1,2,5,13,30,71,169,397,934,2197,5165,12146,28561,
 67156,157907,371293,873034,2052795,4826809,
 11349443,26686340,62748517,147542764,346922420,
 815730721,1918055940,4509991465,10604499373,
 24934727221,58629889045,137858491849]