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 | 0 |
| 2 | 1 |
| 3 | 54 |
| 4 | 1068 |
| 5 | 8550 |
| 6 | 45873 |
| 7 | 177968 |
| 8 | 562032 |
| 9 | 1519560 |
| 10 | 3662625 |
| 11 | 8057390 |
| 12 | 16477020 |
| 13 | 31712850 |
| 14 | 58018793 |
| 15 | 101639700 |
| 16 | 171525568 |
| 17 | 280160068 |
| 18 | 444636297 |
| 19 | 687881890 |
| 20 | 1040201500 |
| 21 | 1541008350 |
| 22 | 2240952065 |
| 23 | 3204279960 |
| 24 | 4511682288 |