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 | 3 |
| 3 | 21 |
| 4 | 47 |
| 5 | 227 |
| 6 | 499 |
| 7 | 2321 |
| 8 | 5087 |
| 9 | 23429 |
| 10 | 51263 |
| 11 | 235881 |
| 12 | 515691 |
| 13 | 2372511 |
| 14 | 5185609 |
| 15 | 23856215 |
| 16 | 52139887 |
| 17 | 239863701 |
| 18 | 524238555 |
| 19 | 2411688233 |
| 20 | 5270900439 |
| 21 | 24248031407 |
| 22 | 52995614649 |