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) |
|---|---|
| 1 | 121 |
| 2 | 427 |
| 3 | 1562 |
| 4 | 5761 |
| 5 | 21239 |
| 6 | 78245 |
| 7 | 287858 |
| 8 | 1059674 |
| 9 | 3901868 |
| 10 | 14366833 |
| 11 | 52894813 |
| 12 | 194725954 |
| 13 | 716822517 |
| 14 | 2638639647 |
| 15 | 9712504051 |
| 16 | 35749337667 |
| 17 | 131581046318 |
| 18 | 484294944395 |
| 19 | 1782459967105 |
| 20 | 6560310404375 |
| 21 | 24144873322163 |
| 22 | 88863279809958 |