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 | 0 |
| 2 | 28 |
| 3 | 351 |
| 4 | 2016 |
| 5 | 7750 |
| 6 | 23220 |
| 7 | 58653 |
| 8 | 130816 |
| 9 | 265356 |
| 10 | 499500 |
| 11 | 885115 |
| 12 | 1492128 |
| 13 | 2412306 |
| 14 | 3763396 |
| 15 | 5693625 |
| 16 | 8386560 |
| 17 | 12066328 |
| 18 | 17003196 |
| 19 | 23519511 |
| 20 | 31996000 |
| 21 | 42878430 |
| 22 | 56684628 |
| 23 | 74011861 |
| 24 | 95544576 |
| 25 | 122062500 |
| 26 | 154449100 |
| 27 | 193700403 |
| 28 | 240934176 |
| 29 | 297399466 |
| 30 | 364486500 |