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 | 9 |
| 2 | 450 |
| 3 | 3675 |
| 4 | 15876 |
| 5 | 49005 |
| 6 | 122694 |
| 7 | 266175 |
| 8 | 520200 |
| 9 | 938961 |
| 10 | 1592010 |
| 11 | 2566179 |
| 12 | 3967500 |
| 13 | 5923125 |
| 14 | 8583246 |
| 15 | 12123015 |
| 16 | 16744464 |
| 17 | 22678425 |
| 18 | 30186450 |
| 19 | 39562731 |
| 20 | 51136020 |
| 21 | 65271549 |
| 22 | 82372950 |
| 23 | 102884175 |
| 24 | 127291416 |
| 25 | 156125025 |
| 26 | 189961434 |
| 27 | 229425075 |
| 28 | 275190300 |
| 29 | 327983301 |