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 | 2 |
| 2 | 4 |
| 3 | 10 |
| 4 | 24 |
| 5 | 54 |
| 6 | 120 |
| 7 | 266 |
| 8 | 593 |
| 9 | 1317 |
| 10 | 2926 |
| 11 | 6501 |
| 12 | 14441 |
| 13 | 32081 |
| 14 | 71266 |
| 15 | 158315 |
| 16 | 351688 |
| 17 | 781255 |
| 18 | 1735512 |
| 19 | 3855339 |
| 20 | 8564410 |
| 21 | 19025337 |
| 22 | 42263673 |
| 23 | 93886277 |
| 24 | 208562871 |
| 25 | 463310210 |
| 26 | 1029216515 |
| 27 | 2286344247 |
| 28 | 5078979923 |
| 29 | 11282656623 |