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 | 1 |
| 2 | 7 |
| 3 | 63 |
| 4 | 761 |
| 5 | 11525 |
| 6 | 209539 |
| 7 | 4440527 |
| 8 | 107374753 |
| 9 | 2915352729 |
| 10 | 87771145551 |
| 11 | 2900744369039 |
| 12 | 104369641697881 |
| 13 | 4060189444664093 |
| 14 | 169777979925475531 |
| 15 | 7592652139022106975 |
| 16 | 361563242499379729537 |
| 17 | 18263719440778358953457 |