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 | 85 |
| 3 | 2230 |
| 4 | 73157 |
| 5 | 2748240 |
| 6 | 113026865 |
| 7 | 4958785285 |
| 8 | 228333859874 |
| 9 | 10915734783342 |
| 10 | 537683100870537 |
| 11 | 27139187103865728 |
| 12 | 1397889420026942941 |
| 13 | 73245245888401473591 |
| 14 | 3894386042722560634412 |
| 15 | 209696591518450916905784 |
| 16 | 11416666685883303837337577 |
| 17 | 627639029564864592680196915 |