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 | 62 |
| 3 | 726 |
| 4 | 4092 |
| 5 | 15620 |
| 6 | 46650 |
| 7 | 117642 |
| 8 | 262136 |
| 9 | 531432 |
| 10 | 999990 |
| 11 | 1771550 |
| 12 | 2985972 |
| 13 | 4826796 |
| 14 | 7529522 |
| 15 | 11390610 |
| 16 | 16777200 |
| 17 | 24137552 |
| 18 | 34012206 |
| 19 | 47045862 |
| 20 | 63999980 |
| 21 | 85766100 |
| 22 | 113379882 |
| 23 | 148035866 |
| 24 | 191102952 |
| 25 | 244140600 |
| 26 | 308915750 |