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 | 1 |
| 2 | 6 |
| 3 | 77 |
| 4 | 1710 |
| 5 | 59882 |
| 6 | 3091200 |
| 7 | 222190789 |
| 8 | 21227659638 |
| 9 | 2599346122814 |
| 10 | 396581942797668 |
| 11 | 73721984076543090 |
| 12 | 16398099489074850108 |
| 13 | 4299479561194904805396 |
| 14 | 1312142733349302902243508 |
| 15 | 461104766297721671082897333 |
| 16 | 184846637953491751729984324518 |
| 17 | 83842823980101547405726058204534 |