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 | 8 |
| 2 | 224 |
| 3 | 5280 |
| 4 | 116480 |
| 5 | 2480640 |
| 6 | 51684864 |
| 7 | 1060899840 |
| 8 | 21541478400 |
| 9 | 433812234240 |
| 10 | 8680043806720 |
| 11 | 172774871965696 |
| 12 | 3424347806171136 |
| 13 | 67626404043161600 |
| 14 | 1331466198928588800 |
| 15 | 26145958720005734400 |
| 16 | 512257621575157678080 |
| 17 | 10016204637370583089152 |
| 18 | 195501127311163895316480 |