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 | 17 |
| 3 | 217 |
| 4 | 2465 |
| 5 | 26281 |
| 6 | 7153 |
| 7 | 588665 |
| 8 | 9492289 |
| 9 | 118985033 |
| 10 | 265558929 |
| 11 | 5611255833 |
| 12 | 7551629537 |
| 13 | 342842572777 |
| 14 | 886559899441 |
| 15 | 29969271650489 |
| 16 | 164170328587905 |
| 17 | 914583003869833 |
| 18 | 5979447221143249 |
| 19 | 53815024990289241 |
| 20 | 628450412988459041 |
| 21 | 7961896726109825321 |