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 | 10 |
| 3 | 35 |
| 4 | 133 |
| 5 | 494 |
| 6 | 1846 |
| 7 | 6887 |
| 8 | 25705 |
| 9 | 95930 |
| 10 | 358018 |
| 11 | 1336139 |
| 12 | 4986541 |
| 13 | 18610022 |
| 14 | 69453550 |
| 15 | 259204175 |
| 16 | 967363153 |
| 17 | 3610248434 |
| 18 | 13473630586 |
| 19 | 50284273907 |
| 20 | 187663465045 |
| 21 | 700369586270 |
| 22 | 2613814880038 |
| 23 | 9754889933879 |
| 24 | 36405744855481 |
| 25 | 135868089488042 |