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 | 2 |
| 3 | 12 |
| 4 | 108 |
| 5 | 1285 |
| 6 | 17073 |
| 7 | 238591 |
| 8 | 3426576 |
| 9 | 50107909 |
| 10 | 742624232 |
| 11 | 11123060678 |
| 12 | 168047007728 |
| 13 | 2557227044764 |
| 14 | 39153010938487 |
| 15 | 602621953061978 |
| 16 | 9317706529987950 |
| 17 | 144648268175306702 |
| 18 | 2253491528465905342 |
| 19 | 35218318816847951974 |