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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 5 |
| 7 | 17 |
| 8 | 54 |
| 9 | 163 |
| 10 | 465 |
| 11 | 1283 |
| 12 | 3480 |
| 13 | 9256 |
| 14 | 24282 |
| 15 | 62812 |
| 16 | 160106 |
| 17 | 401824 |
| 18 | 992033 |
| 19 | 2406329 |
| 20 | 5730955 |
| 21 | 13393760 |
| 22 | 30709772 |
| 23 | 69079030 |
| 24 | 152473837 |
| 25 | 330344629 |
| 26 | 702839150 |
| 27 | 1469214076 |
| 28 | 3019246455 |
| 29 | 6103105779 |
| 30 | 12142291541 |
| 31 | 23790590387 |
| 32 | 45932253637 |
| 33 | 87434850942 |
| 34 | 164188881007 |