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 | 1 |
| 3 | 5 |
| 4 | 17 |
| 5 | 13 |
| 6 | 217 |
| 7 | 139 |
| 8 | 1631 |
| 9 | 3299 |
| 10 | 6487 |
| 11 | 46075 |
| 12 | 7153 |
| 13 | 502829 |
| 14 | 588665 |
| 15 | 2428309 |
| 16 | 9492289 |
| 17 | 5077565 |
| 18 | 118985033 |
| 19 | 88519643 |
| 20 | 808182895 |
| 21 | 1870418611 |
| 22 | 2978678759 |
| 23 | 25423702091 |
| 24 | 7551629537 |
| 25 | 252223018333 |
| 26 | 342842572777 |
| 27 | 1170495537221 |
| 28 | 5284606410545 |
| 29 | 1738366812781 |