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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 62 |
| 5 | 1031 |
| 6 | 24782 |
| 7 | 774180 |
| 8 | 29763855 |
| 9 | 1359654560 |
| 10 | 71984907423 |
| 11 | 4335406418694 |
| 12 | 292753300447894 |
| 13 | 21909289407621069 |
| 14 | 1800106653483146619 |
| 15 | 161097567109713138999 |
| 16 | 15599377878403186676330 |
| 17 | 1625083531855929644443019 |
| 18 | 181238001661004834528467994 |
| 19 | 21545324993880123460418461719 |