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 | 85 |
| 3 | 1243 |
| 4 | 4428 |
| 5 | 31171 |
| 6 | 395011 |
| 7 | 3355439 |
| 8 | 21941552 |
| 9 | 181405030 |
| 10 | 1636558715 |
| 11 | 13131349357 |
| 12 | 101903293904 |
| 13 | 842245479173 |
| 14 | 7011923308367 |
| 15 | 56621895312007 |
| 16 | 457025771024489 |
| 17 | 3744870543676752 |
| 18 | 30634057145033024 |
| 19 | 248841614953642550 |