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 | -1 |
| 1 | 1 |
| 2 | 1351 |
| 3 | 19601 |
| 4 | 119071 |
| 5 | 470449 |
| 6 | 1431431 |
| 7 | 3650401 |
| 8 | 8193151 |
| 9 | 16692641 |
| 10 | 31521799 |
| 11 | 55989361 |
| 12 | 94558751 |
| 13 | 153090001 |
| 14 | 239104711 |
| 15 | 362074049 |
| 16 | 533729791 |
| 17 | 768398401 |
| 18 | 1083358151 |
| 19 | 1499219281 |
| 20 | 2040327199 |
| 21 | 2735188721 |
| 22 | 3616921351 |
| 23 | 4723725601 |
| 24 | 6099380351 |
| 25 | 7793761249 |