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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 14 |
| 6 | 44 |
| 7 | 150 |
| 8 | 496 |
| 9 | 1758 |
| 10 | 6018 |
| 11 | 21782 |
| 12 | 76414 |
| 13 | 280448 |
| 14 | 1001752 |
| 15 | 3714032 |
| 16 | 13450270 |
| 17 | 50259604 |
| 18 | 183995056 |
| 19 | 691863078 |
| 20 | 2555043320 |
| 21 | 9657267848 |
| 22 | 35921300392 |
| 23 | 136360740016 |
| 24 | 510267869416 |
| 25 | 1944193285228 |
| 26 | 7312488701868 |
| 27 | 27950641500876 |
| 28 | 105590010259396 |
| 29 | 404724123141348 |
| 30 | 1534775681029994 |