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 | 1 |
| 2 | 70 |
| 3 | 1407 |
| 4 | 12480 |
| 5 | 69050 |
| 6 | 281946 |
| 7 | 931490 |
| 8 | 2632512 |
| 9 | 6598935 |
| 10 | 15041950 |
| 11 | 31740841 |
| 12 | 62830560 |
| 13 | 117855192 |
| 14 | 211141490 |
| 15 | 363551700 |
| 16 | 604679936 |
| 17 | 975561405 |
| 18 | 1531968822 |
| 19 | 2348375395 |
| 20 | 3522668800 |
| 21 | 5181705606 |
| 22 | 7487800650 |
| 23 | 10646250902 |