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 | 5 |
| 1 | 11 |
| 2 | 115 |
| 3 | 241 |
| 4 | 2525 |
| 5 | 5291 |
| 6 | 55435 |
| 7 | 116161 |
| 8 | 1217045 |
| 9 | 2550251 |
| 10 | 26719555 |
| 11 | 55989361 |
| 12 | 586613165 |
| 13 | 1229215691 |
| 14 | 12878770075 |
| 15 | 26986755841 |
| 16 | 282746328485 |
| 17 | 592479412811 |
| 18 | 6207540456595 |
| 19 | 13007560326001 |
| 20 | 136283143716605 |
| 21 | 285573847759211 |
| 22 | 2992021621308715 |
| 23 | 6269617090376641 |