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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 26 |
| 7 | 57 |
| 8 | 142 |
| 9 | 351 |
| 10 | 902 |
| 11 | 2333 |
| 12 | 6166 |
| 13 | 16381 |
| 14 | 44046 |
| 15 | 119183 |
| 16 | 324862 |
| 17 | 890291 |
| 18 | 2453126 |
| 19 | 6789309 |
| 20 | 18869426 |
| 21 | 52635789 |
| 22 | 147325510 |
| 23 | 413618615 |
| 24 | 1164517198 |
| 25 | 3287073461 |
| 26 | 9300516890 |
| 27 | 26372968983 |
| 28 | 74937177538 |
| 29 | 213333642443 |
| 30 | 608400919106 |
| 31 | 1737954608281 |