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A026621 as a simple table

na(n)
01
11
23
35
410
517
634
760
8120
9217
10434
11798
121596
132970
145940
1511154
1622308
1742185
1884370
19160446
20320892
21613054
221226108
232351440
244702880
259048522
2618097044
2734916300
2869832600
29135059220
30270118440
31523521630
321047043260
332033066025
344066132050
357908332190

[1,1,3,5,10,17,34,60,120,217,434,798,1596,2970,
 5940,11154,22308,42185,84370,160446,320892,613054,
 1226108,2351440,4702880,9048522,18097044,34916300,
 69832600,135059220,270118440,523521630,1047043260,
 2033066025,4066132050,7908332190]