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 | 12 |
| 2 | 454 |
| 3 | 10291 |
| 4 | 240439 |
| 5 | 5741797 |
| 6 | 136204120 |
| 7 | 3232240913 |
| 8 | 76727059034 |
| 9 | 1821136011730 |
| 10 | 43225734223547 |
| 11 | 1025994483127581 |
| 12 | 24352654756464595 |
| 13 | 578026399603342686 |
| 14 | 13719842910804997191 |
| 15 | 325649624449572326065 |