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 | 3 |
| 2 | 7 |
| 3 | 33 |
| 4 | 121 |
| 5 | 843 |
| 6 | 5167 |
| 7 | 46233 |
| 8 | 362881 |
| 9 | 3991683 |
| 10 | 40279687 |
| 11 | 522910113 |
| 12 | 6227383801 |
| 13 | 93409304523 |
| 14 | 1313941673647 |
| 15 | 22324392524313 |
| 16 | 355687428096001 |
| 17 | 6758061133824003 |
| 18 | 122000787836928007 |
| 19 | 2561305169719296033 |