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 | 81 |
| 2 | 1944 |
| 3 | 15540 |
| 4 | 77793 |
| 5 | 311367 |
| 6 | 1092281 |
| 7 | 3518302 |
| 8 | 10643789 |
| 9 | 30548895 |
| 10 | 83538706 |
| 11 | 218139823 |
| 12 | 544930741 |
| 13 | 1304961768 |
| 14 | 3002671615 |
| 15 | 6654904188 |
| 16 | 14242413828 |
| 17 | 29504608642 |
| 18 | 59301307852 |
| 19 | 115889490174 |
| 20 | 220645337145 |
| 21 | 410024971049 |