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A104004 as a simple table

na(n)
01
13
27
316
435
575
6158
7329
8679
91392
102839
115767
1211678
1323589
1447555
1595720
16192427
17386451
18775486
191555153
203117071
216245088
2212507887
2325044431
2450135230
25100345485
26200812363
27401821144
28803960099
291608434427
303217700894
316436748057

[1,3,7,16,35,75,158,329,679,1392,2839,5767,11678,
 23589,47555,95720,192427,386451,775486,1555153,
 3117071,6245088,12507887,25044431,50135230,
 100345485,200812363,401821144,803960099,
 1608434427,3217700894,6436748057]