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 | 1 |
| 1 | 432 |
| 2 | 186192 |
| 3 | 16881984 |
| 4 | 397398096 |
| 5 | 4631467680 |
| 6 | 34415043264 |
| 7 | 187482701952 |
| 8 | 814916270160 |
| 9 | 2975502394224 |
| 10 | 9486501222240 |
| 11 | 27053176872384 |
| 12 | 70486076751552 |
| 13 | 169930845743904 |
| 14 | 384163759953792 |
| 15 | 820167146628480 |
| 16 | 1668890516764752 |
| 17 | 3249628128869472 |
| 18 | 6096883839494544 |