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 | 200 |
| 2 | 6800 |
| 3 | 97880 |
| 4 | 822560 |
| 5 | 4780008 |
| 6 | 21278640 |
| 7 | 77548920 |
| 8 | 242080320 |
| 9 | 668274440 |
| 10 | 1669752016 |
| 11 | 3842321560 |
| 12 | 8251811680 |
| 13 | 16711687720 |
| 14 | 32179616240 |
| 15 | 59307908024 |
| 16 | 105189061760 |
| 17 | 180344446280 |
| 18 | 300011499280 |
| 19 | 485792684760 |
| 20 | 767737840032 |
| 21 | 1186940456040 |
| 22 | 1798737871920 |