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 | 85 |
| 2 | 3570 |
| 3 | 98770 |
| 4 | 2024785 |
| 5 | 32801517 |
| 6 | 437353560 |
| 7 | 4935847320 |
| 8 | 48124511370 |
| 9 | 411731930610 |
| 10 | 3129162672636 |
| 11 | 21335200040700 |
| 12 | 131567066917650 |
| 13 | 738799683460650 |
| 14 | 3799541229226200 |
| 15 | 17984495151670680 |
| 16 | 78682166288559225 |
| 17 | 319357027877093325 |
| 18 | 1206459883091241450 |