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 | 9 |
| 3 | 89 |
| 4 | 1009 |
| 5 | 13457 |
| 6 | 210105 |
| 7 | 3747753 |
| 8 | 74565473 |
| 9 | 1628999841 |
| 10 | 38704241897 |
| 11 | 993034281593 |
| 12 | 27340167242321 |
| 13 | 803154583649329 |
| 14 | 25050853217628313 |
| 15 | 826165199464341705 |
| 16 | 28707262835597618369 |
| 17 | 1047731789671001235265 |
| 18 | 40053733152627299592137 |
| 19 | 1599910554128824794493593 |