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) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 205 |
| 4 | 22265 |
| 5 | 4544185 |
| 6 | 1491632525 |
| 7 | 718181418565 |
| 8 | 476768795646785 |
| 9 | 417370516232719345 |
| 10 | 465849831125196593045 |
| 11 | 645702241048404020542525 |
| 12 | 1088120580608731523115639305 |
| 13 | 2190881346273790815462670984105 |