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 | 252 |
| 2 | 1127 |
| 3 | 4977 |
| 4 | 22736 |
| 5 | 105813 |
| 6 | 491533 |
| 7 | 2269938 |
| 8 | 10462235 |
| 9 | 48259083 |
| 10 | 222798408 |
| 11 | 1028746629 |
| 12 | 4749274209 |
| 13 | 21922813539 |
| 14 | 101196577809 |
| 15 | 467142348798 |
| 16 | 2156444661242 |
| 17 | 9954648966159 |
| 18 | 45952741121083 |
| 19 | 212127214776309 |