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 | 23 |
| 2 | 529 |
| 3 | 12167 |
| 4 | 279841 |
| 5 | 6436343 |
| 6 | 148035889 |
| 7 | 3404825447 |
| 8 | 78310985281 |
| 9 | 1801152661463 |
| 10 | 41426511213649 |
| 11 | 952809757913927 |
| 12 | 21914624432020321 |
| 13 | 504036361936467383 |
| 14 | 11592836324538749809 |
| 15 | 266635235464391245607 |
| 16 | 6132610415680998648961 |
| 17 | 141050039560662968926103 |
| 18 | 3244150909895248285300369 |
| 19 | 74615470927590710561908487 |
| 20 | 1716155831334586342923895201 |