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 | 3 |
| 2 | 25 |
| 3 | 427 |
| 4 | 12465 |
| 5 | 555731 |
| 6 | 35135945 |
| 7 | 2990414715 |
| 8 | 329655706465 |
| 9 | 45692713833379 |
| 10 | 7777794952988025 |
| 11 | 1595024111042171723 |
| 12 | 387863354088927172625 |
| 13 | 110350957750914345093747 |
| 14 | 36315529600705266098580265 |
| 15 | 13687860690719716241164167451 |
| 16 | 5858139922124796551409938058945 |