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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 10 |
| 5 | 55 |
| 6 | 230 |
| 7 | 770 |
| 8 | 2156 |
| 9 | 5250 |
| 10 | 11460 |
| 11 | 22935 |
| 12 | 42790 |
| 13 | 75361 |
| 14 | 126490 |
| 15 | 203840 |
| 16 | 317240 |
| 17 | 479060 |
| 18 | 704616 |
| 19 | 1012605 |
| 20 | 1425570 |
| 21 | 1970395 |
| 22 | 2678830 |
| 23 | 3588046 |
| 24 | 4741220 |
| 25 | 6188150 |
| 26 | 7985900 |
| 27 | 10199475 |
| 28 | 12902526 |
| 29 | 16178085 |
| 30 | 20119330 |