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 | 98 |
| 2 | 1862 |
| 3 | 19796 |
| 4 | 160454 |
| 5 | 1114428 |
| 6 | 7008540 |
| 7 | 41132520 |
| 8 | 229435206 |
| 9 | 1230873644 |
| 10 | 6403088692 |
| 11 | 32488200472 |
| 12 | 161473267228 |
| 13 | 788758622680 |
| 14 | 3796375603320 |
| 15 | 18040943163600 |
| 16 | 84786596572230 |
| 17 | 394599588033420 |
| 18 | 1820669979129540 |
| 19 | 8335975464699960 |