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 | 1 |
| 1 | 5 |
| 2 | 37 |
| 3 | 317 |
| 4 | 2885 |
| 5 | 27105 |
| 6 | 259765 |
| 7 | 2523813 |
| 8 | 24768069 |
| 9 | 244941833 |
| 10 | 2437083697 |
| 11 | 24367722725 |
| 12 | 244639635749 |
| 13 | 2464477467769 |
| 14 | 24899468129405 |
| 15 | 252202062544617 |
| 16 | 2560119328830725 |
| 17 | 26038134699958233 |
| 18 | 265278657849511561 |
| 19 | 2706809063101138409 |
| 20 | 27657194997231516145 |
| 21 | 282941098708193905485 |