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 | 3 |
| 2 | 6 |
| 3 | 11 |
| 4 | 24 |
| 5 | 69 |
| 6 | 227 |
| 7 | 753 |
| 8 | 2451 |
| 9 | 8004 |
| 10 | 27138 |
| 11 | 97806 |
| 12 | 375313 |
| 13 | 1511868 |
| 14 | 6292884 |
| 15 | 26826701 |
| 16 | 116994453 |
| 17 | 523646202 |
| 18 | 2414394601 |
| 19 | 11487130362 |
| 20 | 56341183365 |
| 21 | 284110648983 |
| 22 | 1468690344087 |
| 23 | 7766823788295 |
| 24 | 41976012524088 |
| 25 | 231812530642644 |
| 26 | 1308325741771908 |