This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 19 |
| 3 | 343 |
| 4 | 6175 |
| 5 | 111151 |
| 6 | 2000719 |
| 7 | 36012943 |
| 8 | 648232975 |
| 9 | 11668193551 |
| 10 | 210027483919 |
| 11 | 3780494710543 |
| 12 | 68048904789775 |
| 13 | 1224880286215951 |
| 14 | 22047845151887119 |
| 15 | 396861212733968143 |
| 16 | 7143501829211426575 |
| 17 | 128583032925805678351 |