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 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 18 |
| 5 | 51 |
| 6 | 266 |
| 7 | 1518 |
| 8 | 11396 |
| 9 | 111218 |
| 10 | 1345019 |
| 11 | 21178437 |
| 12 | 420441727 |
| 13 | 10691248879 |
| 14 | 346431341394 |
| 15 | 14306876354446 |
| 16 | 754052504644414 |