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 | 11 |
| 2 | 101 |
| 3 | 781 |
| 4 | 5611 |
| 5 | 39161 |
| 6 | 270281 |
| 7 | 1857451 |
| 8 | 12744061 |
| 9 | 87382901 |
| 10 | 599019851 |
| 11 | 4105974961 |
| 12 | 28143378001 |
| 13 | 192899171531 |
| 14 | 1322154751061 |
| 15 | 9062194370461 |
| 16 | 62113232767531 |
| 17 | 425730505493801 |
| 18 | 2918000490238361 |
| 19 | 20000273409331051 |
| 20 | 137083914639998701 |
| 21 | 939587132382262661 |