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 | 12 |
| 2 | 48 |
| 3 | 234 |
| 4 | 1320 |
| 5 | 7806 |
| 6 | 46692 |
| 7 | 279978 |
| 8 | 1679664 |
| 9 | 10077750 |
| 10 | 60466236 |
| 11 | 362797122 |
| 12 | 2176782408 |
| 13 | 13060694094 |
| 14 | 78364164180 |
| 15 | 470184984666 |
| 16 | 2821109907552 |
| 17 | 16926659444838 |
| 18 | 101559956668524 |
| 19 | 609359740010610 |
| 20 | 3656158440063096 |
| 21 | 21936950640377982 |
| 22 | 131621703842267268 |