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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 42 |
| 6 | 131 |
| 7 | 417 |
| 8 | 1341 |
| 9 | 4334 |
| 10 | 14041 |
| 11 | 45542 |
| 12 | 147798 |
| 13 | 479779 |
| 14 | 1557649 |
| 15 | 5057369 |
| 16 | 16420730 |
| 17 | 53317085 |
| 18 | 173118414 |
| 19 | 562110290 |
| 20 | 1825158051 |
| 21 | 5926246929 |
| 22 | 19242396629 |
| 23 | 62479659622 |
| 24 | 202870165265 |
| 25 | 658715265222 |
| 26 | 2138834994142 |
| 27 | 6944753544643 |
| 28 | 22549473023585 |