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 | 4 |
| 2 | 28 |
| 3 | 268 |
| 4 | 3244 |
| 5 | 47404 |
| 6 | 810988 |
| 7 | 15891628 |
| 8 | 350851564 |
| 9 | 8615761324 |
| 10 | 232911898348 |
| 11 | 6872755977388 |
| 12 | 219799913877484 |
| 13 | 7572909749244844 |
| 14 | 279630706025296108 |
| 15 | 11016315458773541548 |
| 16 | 461211305514352065004 |
| 17 | 20448268640012928321964 |