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 | 1 |
| 2 | 3 |
| 3 | 77 |
| 4 | 877 |
| 5 | 6271 |
| 6 | 36049 |
| 7 | 36423 |
| 8 | 422137 |
| 9 | 49691099 |
| 10 | 1448086909 |
| 11 | 11631128477 |
| 12 | 2334008785 |
| 13 | 44471893747 |
| 14 | 1827784004699 |
| 15 | 832564679309 |
| 16 | 39202882860913 |
| 17 | 196334425398149 |
| 18 | 3473612060358899 |
| 19 | 3478128507653999 |
| 20 | 205449856947685261 |
| 21 | 303604578504856471 |