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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 59 |
| 5 | 255 |
| 6 | 831 |
| 7 | 2275 |
| 8 | 5524 |
| 9 | 12085 |
| 10 | 24406 |
| 11 | 46310 |
| 12 | 83174 |
| 13 | 142710 |
| 14 | 235735 |
| 15 | 376360 |
| 16 | 583385 |
| 17 | 881501 |
| 18 | 1301405 |
| 19 | 1882049 |
| 20 | 2672370 |
| 21 | 3731211 |
| 22 | 5130700 |
| 23 | 6958604 |
| 24 | 9317900 |
| 25 | 12331596 |
| 26 | 16145805 |
| 27 | 20928774 |
| 28 | 26877495 |
| 29 | 34221595 |
| 30 | 43221595 |