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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 5158 |
| 6 | 1822014 |
| 7 | 242384856 |
| 8 | 19323413187 |
| 9 | 1130781824398 |
| 10 | 54076536713976 |
| 11 | 2251621794635088 |
| 12 | 84973986733001061 |
| 13 | 2985450779006443846 |
| 14 | 99474230412387811666 |
| 15 | 3185003930126491696920 |
| 16 | 98939258210106714816135 |
| 17 | 3003063241991742340646382 |
| 18 | 89537653738976723063722828 |