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 | 9 |
| 1 | 28 |
| 2 | 513 |
| 3 | 1567 |
| 4 | 28719 |
| 5 | 87724 |
| 6 | 1607751 |
| 7 | 4910977 |
| 8 | 90005337 |
| 9 | 274926988 |
| 10 | 5038691121 |
| 11 | 15391000351 |
| 12 | 282076697439 |
| 13 | 861621092668 |
| 14 | 15791256365463 |
| 15 | 48235390189057 |
| 16 | 884028279768489 |
| 17 | 2700320229494524 |
| 18 | 49489792410669921 |