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 | 29 |
| 3 | 191 |
| 4 | 1405 |
| 5 | 11389 |
| 6 | 100585 |
| 7 | 958271 |
| 8 | 9758009 |
| 9 | 105258005 |
| 10 | 1191424981 |
| 11 | 13996923775 |
| 12 | 168226145269 |
| 13 | 2023185762701 |
| 14 | 23353840650785 |
| 15 | 232509328597439 |
| 16 | 1131674305674865 |
| 17 | -36251185098769499 |
| 18 | -1837042409174409971 |