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 | 5 |
| 2 | 20 |
| 3 | 70 |
| 4 | 210 |
| 5 | 546 |
| 6 | 1260 |
| 7 | 2640 |
| 8 | 5115 |
| 9 | 9295 |
| 10 | 16016 |
| 11 | 26390 |
| 12 | 41860 |
| 13 | 64260 |
| 14 | 95880 |
| 15 | 139536 |
| 16 | 198645 |
| 17 | 277305 |
| 18 | 380380 |
| 19 | 513590 |
| 20 | 683606 |
| 21 | 898150 |
| 22 | 1166100 |
| 23 | 1497600 |
| 24 | 1904175 |
| 25 | 2398851 |
| 26 | 2996280 |
| 27 | 3712870 |
| 28 | 4566920 |
| 29 | 5578760 |
| 30 | 6770896 |
| 31 | 8168160 |
| 32 | 9797865 |
| 33 | 11689965 |