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 | 11 |
| 3 | 43 |
| 4 | 135 |
| 5 | 375 |
| 6 | 967 |
| 7 | 2375 |
| 8 | 5639 |
| 9 | 13063 |
| 10 | 29703 |
| 11 | 66567 |
| 12 | 147463 |
| 13 | 323591 |
| 14 | 704519 |
| 15 | 1523719 |
| 16 | 3276807 |
| 17 | 7012359 |
| 18 | 14942215 |
| 19 | 31719431 |
| 20 | 67108871 |
| 21 | 141557767 |
| 22 | 297795591 |
| 23 | 624951303 |
| 24 | 1308622855 |
| 25 | 2734686215 |
| 26 | 5704253447 |
| 27 | 11878268935 |
| 28 | 24696061959 |
| 29 | 51271172103 |