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 | 0 |
| 3 | 16 |
| 4 | 408 |
| 5 | 8544 |
| 6 | 62266 |
| 7 | 291908 |
| 8 | 1021254 |
| 9 | 2916232 |
| 10 | 7179314 |
| 11 | 15790572 |
| 12 | 31795390 |
| 13 | 59638832 |
| 14 | 105546666 |
| 15 | 177953044 |
| 16 | 287974838 |
| 17 | 449932632 |
| 18 | 681918370 |
| 19 | 1006409660 |
| 20 | 1450930734 |
| 21 | 2048760064 |
| 22 | 2839684634 |
| 23 | 3870800868 |
| 24 | 5197362214 |
| 25 | 6883673384 |