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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 4 |
| 8 | 11 |
| 9 | 20 |
| 10 | 51 |
| 11 | 108 |
| 12 | 267 |
| 13 | 619 |
| 14 | 1541 |
| 15 | 3762 |
| 16 | 9497 |
| 17 | 23907 |
| 18 | 61216 |
| 19 | 157211 |
| 20 | 407919 |
| 21 | 1063398 |
| 22 | 2792026 |
| 23 | 7365532 |
| 24 | 19535887 |
| 25 | 52037837 |
| 26 | 139213244 |
| 27 | 373820978 |
| 28 | 1007420841 |
| 29 | 2723783122 |
| 30 | 7387129661 |
| 31 | 20091790330 |
| 32 | 54793762295 |
| 33 | 149808274055 |
| 34 | 410553630946 |