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 | 0 |
| 2 | 0 |
| 3 | 5 |
| 4 | 175 |
| 5 | 9426 |
| 6 | 751365 |
| 7 | 84012191 |
| 8 | 12644839585 |
| 9 | 2479642897109 |
| 10 | 617049443550205 |
| 11 | 190678639438170502 |
| 12 | 71860665148118443795 |
| 13 | 32527628234581386962713 |
| 14 | 17454341903042193018433239 |
| 15 | 10978059489008346809004564072 |
| 16 | 8013452442154510131205645967978 |