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 | 2 |
| 2 | 13 |
| 3 | 31 |
| 4 | 19 |
| 5 | 6173 |
| 6 | 123457 |
| 7 | 154321 |
| 8 | 333667 |
| 9 | 333667 |
| 10 | 3388877 |
| 11 | 4281283 |
| 12 | 2630197 |
| 13 | 26798700427 |
| 14 | 8663199947 |
| 15 | 2523244037 |
| 16 | 12873492085621702963 |
| 17 | 32929947197382727 |
| 18 | 17539959825403 |
| 19 | 71595329159622797 |
| 20 | 325339942922532262019 |
| 21 | 9999103057380477280607 |
| 22 | 17465868005034957301 |
| 23 | 1423364280511 |