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 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 157 |
| 5 | 1437 |
| 6 | 13725 |
| 7 | 128413 |
| 8 | 1176989 |
| 9 | 20051357 |
| 10 | 355595677 |
| 11 | 6261175709 |
| 12 | 109340390813 |
| 13 | 1896046785949 |
| 14 | 32682372363677 |
| 15 | 560447953696157 |
| 16 | 9567647208437149 |
| 17 | 315812421869630877 |
| 18 | 10692105963331253661 |