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 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 43 |
| 5 | 156 |
| 6 | 535 |
| 7 | 1956 |
| 8 | 7175 |
| 9 | 26418 |
| 10 | 98375 |
| 11 | 367176 |
| 12 | 1378022 |
| 13 | 5193625 |
| 14 | 19641164 |
| 15 | 74535167 |
| 16 | 283651169 |
| 17 | 1082274210 |
| 18 | 4139129734 |
| 19 | 15863315213 |
| 20 | 60913982404 |
| 21 | 234317240601 |
| 22 | 902804442380 |
| 23 | 3483620505111 |
| 24 | 13460665855850 |