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 | 10 |
| 2 | 54 |
| 3 | 210 |
| 4 | 660 |
| 5 | 1782 |
| 6 | 4290 |
| 7 | 9438 |
| 8 | 19305 |
| 9 | 37180 |
| 10 | 68068 |
| 11 | 119340 |
| 12 | 201552 |
| 13 | 329460 |
| 14 | 523260 |
| 15 | 810084 |
| 16 | 1225785 |
| 17 | 1817046 |
| 18 | 2643850 |
| 19 | 3782350 |
| 20 | 5328180 |
| 21 | 7400250 |
| 22 | 10145070 |
| 23 | 13741650 |
| 24 | 18407025 |
| 25 | 24402456 |
| 26 | 32040360 |
| 27 | 41692024 |
| 28 | 53796160 |