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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 6 |
| 8 | 30 |
| 9 | 69 |
| 10 | 230 |
| 11 | 662 |
| 12 | 2244 |
| 13 | 6197 |
| 14 | 20782 |
| 15 | 57963 |
| 16 | 185236 |
| 17 | 534294 |
| 18 | 1636436 |
| 19 | 4788888 |
| 20 | 14148505 |
| 21 | 41505698 |
| 22 | 119551191 |
| 23 | 347802192 |
| 24 | 984873101 |
| 25 | 2823972122 |
| 26 | 7899999963 |
| 27 | 22281193586 |
| 28 | 61710573450 |
| 29 | 171287868395 |
| 30 | 469925476292 |