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 | 5 |
| 2 | 19 |
| 3 | 41 |
| 4 | 109 |
| 5 | 209 |
| 6 | 505 |
| 7 | 929 |
| 8 | 2161 |
| 9 | 3905 |
| 10 | 8929 |
| 11 | 16001 |
| 12 | 36289 |
| 13 | 64769 |
| 14 | 146305 |
| 15 | 260609 |
| 16 | 587521 |
| 17 | 1045505 |
| 18 | 2354689 |
| 19 | 4188161 |
| 20 | 9427969 |
| 21 | 16764929 |
| 22 | 37730305 |
| 23 | 67084289 |
| 24 | 150958081 |
| 25 | 268386305 |
| 26 | 603906049 |
| 27 | 1073643521 |
| 28 | 2415771649 |
| 29 | 4294770689 |
| 30 | 9663381505 |
| 31 | 17179475969 |