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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 10 |
| 4 | 134 |
| 5 | 1162 |
| 6 | 14159 |
| 7 | 157598 |
| 8 | 1893418 |
| 9 | 22549653 |
| 10 | 273912278 |
| 11 | 3343968014 |
| 12 | 41175336250 |
| 13 | 509775461915 |
| 14 | 6345933759165 |
| 15 | 79347706998224 |
| 16 | 996146776785323 |
| 17 | 12549773566364371 |
| 18 | 158605269941072464 |
| 19 | 2010125063939318784 |
[0,3,10,134,1162,14159,157598,1893418,22549653, 273912278,3343968014,41175336250,509775461915, 6345933759165,79347706998224,996146776785323, 12549773566364371,158605269941072464, 2010125063939318784] |