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 | 1 |
| 2 | 20 |
| 3 | 135 |
| 4 | 544 |
| 5 | 1625 |
| 6 | 3996 |
| 7 | 8575 |
| 8 | 16640 |
| 9 | 29889 |
| 10 | 50500 |
| 11 | 81191 |
| 12 | 125280 |
| 13 | 186745 |
| 14 | 270284 |
| 15 | 381375 |
| 16 | 526336 |
| 17 | 712385 |
| 18 | 947700 |
| 19 | 1241479 |
| 20 | 1604000 |
| 21 | 2046681 |
| 22 | 2582140 |
| 23 | 3224255 |
| 24 | 3988224 |
| 25 | 4890625 |
| 26 | 5949476 |
| 27 | 7184295 |
| 28 | 8616160 |
| 29 | 10267769 |
| 30 | 12163500 |