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 | 40 |
| 1 | 172 |
| 2 | 801 |
| 3 | 4025 |
| 4 | 21709 |
| 5 | 124997 |
| 6 | 764538 |
| 7 | 4945866 |
| 8 | 33710579 |
| 9 | 241273791 |
| 10 | 1807949285 |
| 11 | 14146621349 |
| 12 | 115316563400 |
| 13 | 977216138500 |
| 14 | 8592652709041 |
| 15 | 78263082518169 |
| 16 | 737228862573509 |
| 17 | 7172071557558805 |
| 18 | 71964172085006666 |
| 19 | 743866850349092130 |
| 20 | 7912230538914051723 |