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 | 5 |
| 2 | 40 |
| 3 | 255 |
| 4 | 1040 |
| 5 | 3145 |
| 6 | 7800 |
| 7 | 16835 |
| 8 | 32800 |
| 9 | 59085 |
| 10 | 100040 |
| 11 | 161095 |
| 12 | 248880 |
| 13 | 371345 |
| 14 | 537880 |
| 15 | 759435 |
| 16 | 1048640 |
| 17 | 1419925 |
| 18 | 1889640 |
| 19 | 2476175 |
| 20 | 3200080 |
| 21 | 4084185 |
| 22 | 5153720 |
| 23 | 6436435 |
| 24 | 7962720 |
| 25 | 9765725 |
| 26 | 11881480 |
| 27 | 14349015 |
| 28 | 17210480 |
| 29 | 20511265 |