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 | 242 |
| 2 | 11242 |
| 3 | 210474 |
| 4 | 2224178 |
| 5 | 15804866 |
| 6 | 83999962 |
| 7 | 358159802 |
| 8 | 1285951458 |
| 9 | 4025098770 |
| 10 | 11267030346 |
| 11 | 28752157898 |
| 12 | 67886298898 |
| 13 | 150029971938 |
| 14 | 313233102138 |
| 15 | 622431249242 |
| 16 | 1184409984450 |
| 17 | 2169185665330 |
| 18 | 3839847763114 |
| 19 | 6593364255082 |
| 20 | 11015371578354 |
| 21 | 17952558422018 |