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 | 13 |
| 2 | 99 |
| 3 | 827 |
| 4 | 6743 |
| 5 | 55447 |
| 6 | 454385 |
| 7 | 3729091 |
| 8 | 30584687 |
| 9 | 250916131 |
| 10 | 2058249165 |
| 11 | 16884649135 |
| 12 | 138508056265 |
| 13 | 1136221529549 |
| 14 | 9320704799431 |
| 15 | 76460212316453 |
| 16 | 627222736888811 |
| 17 | 5145271430670385 |
| 18 | 42207992410219447 |
| 19 | 346243111960194009 |