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 | 3 |
| 2 | 9 |
| 3 | 27 |
| 4 | 79 |
| 5 | 229 |
| 6 | 657 |
| 7 | 1871 |
| 8 | 5295 |
| 9 | 14909 |
| 10 | 41801 |
| 11 | 116783 |
| 12 | 325287 |
| 13 | 903741 |
| 14 | 2505377 |
| 15 | 6932479 |
| 16 | 19151519 |
| 17 | 52833853 |
| 18 | 145578265 |
| 19 | 400705135 |
| 20 | 1101936119 |
| 21 | 3027902045 |
| 22 | 8314284721 |
| 23 | 22816209855 |
| 24 | 62579270191 |
| 25 | 171559358493 |
| 26 | 470132335209 |
| 27 | 1287861941487 |
| 28 | 3526800739399 |