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 | 429 |
| 2 | 62016 |
| 3 | 807300 |
| 4 | 5101360 |
| 5 | 21732542 |
| 6 | 71916768 |
| 7 | 199448964 |
| 8 | 485325150 |
| 9 | 1067658735 |
| 10 | 2167714560 |
| 11 | 4122884232 |
| 12 | 7427426292 |
| 13 | 12781794760 |
| 14 | 21151379600 |
| 15 | 33835482648 |
| 16 | 52547352546 |
| 17 | 79506102225 |
| 18 | 117541332480 |
| 19 | 170211285180 |
| 20 | 241935349656 |
| 21 | 338141745810 |
| 22 | 465431207488 |