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 | 5 |
| 4 | 25 |
| 5 | 61 |
| 6 | 61 |
| 7 | 305 |
| 8 | 4069 |
| 9 | 91058273 |
| 10 | 91058273 |
| 11 | 86169701 |
| 12 | 455291365 |
| 13 | 430848505 |
| 14 | 1129161898 |
| 15 | 430848505 |
| 16 | 2154242525 |
| 17 | 5554554653 |
| 18 | 3952066643 |
| 19 | 19760333215 |
| 20 | 5173153429 |
| 21 | 20889495113 |
| 22 | 25865767145 |
| 23 | 25865767145 |
| 24 | 104447475565 |
| 25 | 129328835725 |
| 26 | 241076065223 |
| 27 | 350624513369 |