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 | 15 |
| 3 | 149 |
| 4 | 2357 |
| 5 | 10541 |
| 6 | 57735 |
| 7 | 745356 |
| 8 | 1490712 |
| 9 | 182574186 |
| 10 | 2357022604 |
| 11 | 298142397 |
| 12 | 7453559925 |
| 13 | 1490711985 |
| 14 | 10540925533895 |
| 15 | 74535599249993 |
| 16 | 105409255338946 |
| 17 | 7453559924999299 |
| 18 | 14907119849998598 |
| 19 | 471404520791031683 |