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 | 0 |
| 2 | 1 |
| 3 | 16 |
| 4 | 1517 |
| 5 | 18684 |
| 6 | 1024028 |
| 7 | 17066492 |
| 8 | 681728204 |
| 9 | 13916993782 |
| 10 | 467260456608 |
| 11 | 10754797724124 |
| 12 | 328076475659033 |
| 13 | 8091313110371792 |
| 14 | 233977398720987284 |
| 15 | 6002042996016384360 |
| 16 | 168435972906750526954 |
| 17 | 4418118886987754341770 |
| 18 | 121913396076344218930045 |