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 | 6 |
| 1 | 48 |
| 2 | 378 |
| 3 | 2976 |
| 4 | 23430 |
| 5 | 184464 |
| 6 | 1452282 |
| 7 | 11433792 |
| 8 | 90018054 |
| 9 | 708710640 |
| 10 | 5579667066 |
| 11 | 43928625888 |
| 12 | 345849340038 |
| 13 | 2722866094416 |
| 14 | 21437079415290 |
| 15 | 168773769227904 |
| 16 | 1328753074407942 |
| 17 | 10461250826035632 |
| 18 | 82361253533877114 |
| 19 | 648428777444981280 |
| 20 | 5105068966025973126 |