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 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 182 |
| 5 | 1300 |
| 6 | 12634 |
| 7 | 153598 |
| 8 | 2231004 |
| 9 | 37250236 |
| 10 | 699699968 |
| 11 | 14574247086 |
| 12 | 333121322514 |
| 13 | 8286605836248 |
| 14 | 222824153996898 |
| 15 | 6439779836400464 |
| 16 | 199051769194393718 |
| 17 | 6552226226766384216 |
| 18 | 228826838199807593530 |
| 19 | 8450335361750379998822 |
| 20 | 329002470731473098130572 |