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) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 39 |
| 5 | 183 |
| 6 | 269 |
| 7 | 297 |
| 8 | 3665 |
| 9 | 924109 |
| 10 | 4033584664 |
| 11 | 189735334108567843 |
| 12 | 143328637617784835849199812569 |
| 13 | 120097694647175196504595164577946008733316783100605 |