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 | 5 |
| 1 | 9 |
| 2 | 23 |
| 3 | 66 |
| 4 | 202 |
| 5 | 645 |
| 6 | 2123 |
| 7 | 7150 |
| 8 | 24518 |
| 9 | 85306 |
| 10 | 300390 |
| 11 | 1068484 |
| 12 | 3833364 |
| 13 | 13855085 |
| 14 | 50401395 |
| 15 | 184392150 |
| 16 | 677998830 |
| 17 | 2504191470 |
| 18 | 9286661010 |
| 19 | 34564913820 |
| 20 | 129077071500 |
| 21 | 483474711330 |
| 22 | 1815928888254 |