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 | 3281 |
| 2 | 195313 |
| 3 | 2882401 |
| 4 | 21523361 |
| 5 | 107179441 |
| 6 | 407865361 |
| 7 | 1281445313 |
| 8 | 3487878721 |
| 9 | 8491781521 |
| 10 | 18911429681 |
| 11 | 39155492641 |
| 12 | 76293945313 |
| 13 | 141214768241 |
| 14 | 250123206481 |
| 15 | 426445518721 |
| 16 | 703204309121 |
| 17 | 1125937695313 |
| 18 | 1756239726961 |
| 19 | 2676004630241 |
| 20 | 3992462614561 |
| 21 | 5844100138801 |