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 | 2 |
| 2 | 4 |
| 3 | 9 |
| 4 | 25 |
| 5 | 88 |
| 6 | 406 |
| 7 | 2451 |
| 8 | 19450 |
| 9 | 202681 |
| 10 | 2769965 |
| 11 | 49519392 |
| 12 | 1154411138 |
| 13 | 34978238590 |
| 14 | 1373171398361 |
| 15 | 69648249299517 |
| 16 | 4552778914494604 |