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 | 9 |
| 2 | 163 |
| 3 | 1476 |
| 4 | 26731 |
| 5 | 242055 |
| 6 | 4383721 |
| 7 | 39695544 |
| 8 | 718903513 |
| 9 | 6509827161 |
| 10 | 117895792411 |
| 11 | 1067571958860 |
| 12 | 19334191051891 |
| 13 | 175075291425879 |
| 14 | 3170689436717713 |
| 15 | 28711280221885296 |
| 16 | 519973733430653041 |
| 17 | 4708474881097762665 |
| 18 | 85272521593190381011 |
| 19 | 772161169219811191764 |