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 | 5 |
| 2 | 23 |
| 3 | 101 |
| 4 | 431 |
| 5 | 1805 |
| 6 | 7463 |
| 7 | 30581 |
| 8 | 124511 |
| 9 | 504605 |
| 10 | 2038103 |
| 11 | 8211461 |
| 12 | 33022991 |
| 13 | 132623405 |
| 14 | 532087943 |
| 15 | 2133134741 |
| 16 | 8546887871 |
| 17 | 34230598205 |
| 18 | 137051532983 |
| 19 | 548593552421 |
| 20 | 2195536471151 |
| 21 | 8785632669005 |
| 22 | 35152991029223 |