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 | 4 |
| 2 | 23 |
| 3 | 178 |
| 4 | 1763 |
| 5 | 21504 |
| 6 | 313585 |
| 7 | 5342068 |
| 8 | 104376201 |
| 9 | 2304582544 |
| 10 | 56807530871 |
| 11 | 1547599725720 |
| 12 | 46202052688603 |
| 13 | 1500629138909632 |
| 14 | 52697989385197137 |
| 15 | 1990117967149595824 |
| 16 | 80440669725095395025 |
| 17 | 3465573101368534916928 |