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 | 4 |
| 2 | 77 |
| 3 | 1170 |
| 4 | 14107 |
| 5 | 139471 |
| 6 | 1177568 |
| 7 | 8721417 |
| 8 | 57801225 |
| 9 | 347923603 |
| 10 | 1924356711 |
| 11 | 9871703167 |
| 12 | 47329086175 |
| 13 | 213435856527 |
| 14 | 910247506472 |
| 15 | 3688234465315 |
| 16 | 14255722610693 |
| 17 | 52746861442115 |
| 18 | 187406263165391 |
| 19 | 641125854338628 |