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 | 5 |
| 2 | 43 |
| 3 | 709 |
| 4 | 23003 |
| 5 | 1481957 |
| 6 | 190305691 |
| 7 | 48796386661 |
| 8 | 25003673060507 |
| 9 | 25613941912987493 |
| 10 | 52467767892904362139 |
| 11 | 214929296497738201165669 |
| 12 | 1760788099067877263041671323 |
| 13 | 28849467307107603960961499533157 |