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 | 9 |
| 3 | 58 |
| 4 | 446 |
| 5 | 3792 |
| 6 | 34369 |
| 7 | 325538 |
| 8 | 3184206 |
| 9 | 31917772 |
| 10 | 326156474 |
| 11 | 3385065348 |
| 12 | 35585008816 |
| 13 | 378116619692 |
| 14 | 4054571715729 |
| 15 | 43820012675698 |
| 16 | 476830454211926 |
| 17 | 5219833626494412 |
| 18 | 57444768682580494 |
| 19 | 635176593108262028 |