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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 6 |
| 7 | 21 |
| 8 | 56 |
| 9 | 126 |
| 10 | 252 |
| 11 | 463 |
| 12 | 805 |
| 13 | 1378 |
| 14 | 2457 |
| 15 | 4823 |
| 16 | 10556 |
| 17 | 24753 |
| 18 | 58976 |
| 19 | 137808 |
| 20 | 310974 |
| 21 | 675850 |
| 22 | 1420916 |
| 23 | 2914906 |
| 24 | 5900631 |
| 25 | 11931283 |
| 26 | 24360194 |
| 27 | 50559900 |
| 28 | 106791426 |
| 29 | 228638698 |
| 30 | 492908713 |
| 31 | 1062928750 |
| 32 | 2281600816 |
| 33 | 4862773227 |
| 34 | 10287720750 |