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 | 4 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 26 |
| 6 | 131 |
| 7 | 227 |
| 8 | 301 |
| 9 | 567 |
| 10 | 879 |
| 11 | 3240 |
| 12 | 11051 |
| 13 | 8048 |
| 14 | 38911 |
| 15 | 7321 |
| 16 | 97309 |
| 17 | 108190 |
| 18 | 6294 |
| 19 | 138124 |
| 20 | 4675268 |
| 21 | 2687104 |
| 22 | 1336154 |
| 23 | 5774420 |