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 | 5 |
| 3 | 16 |
| 4 | 56 |
| 5 | 202 |
| 6 | 741 |
| 7 | 2752 |
| 8 | 10318 |
| 9 | 38972 |
| 10 | 148070 |
| 11 | 565280 |
| 12 | 2166646 |
| 13 | 8332378 |
| 14 | 32136205 |
| 15 | 124249856 |
| 16 | 481433286 |
| 17 | 1868972828 |
| 18 | 7267804550 |
| 19 | 28304698336 |
| 20 | 110383060776 |
| 21 | 431000853028 |
| 22 | 1684754608210 |
| 23 | 6592277745536 |
| 24 | 25818887839956 |