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 | 30 |
| 3 | 342 |
| 4 | 1960 |
| 5 | 7575 |
| 6 | 22806 |
| 7 | 57820 |
| 8 | 129312 |
| 9 | 262845 |
| 10 | 495550 |
| 11 | 879186 |
| 12 | 1483560 |
| 13 | 2400307 |
| 14 | 3747030 |
| 15 | 5671800 |
| 16 | 8358016 |
| 17 | 12029625 |
| 18 | 16956702 |
| 19 | 23461390 |
| 20 | 31924200 |
| 21 | 42790671 |
| 22 | 56578390 |
| 23 | 73884372 |
| 24 | 95392800 |
| 25 | 121883125 |
| 26 | 154238526 |
| 27 | 193454730 |
| 28 | 240649192 |
| 29 | 297070635 |