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 | 1 |
| 4 | 2 |
| 5 | 8 |
| 6 | 29 |
| 7 | 113 |
| 8 | 444 |
| 9 | 1763 |
| 10 | 6951 |
| 11 | 27395 |
| 12 | 107672 |
| 13 | 422330 |
| 14 | 1654180 |
| 15 | 6472518 |
| 16 | 25308760 |
| 17 | 98923442 |
| 18 | 386589398 |
| 19 | 1510737079 |
| 20 | 5904291401 |
| 21 | 23079308104 |
| 22 | 90236258057 |
| 23 | 352908128341 |
| 24 | 1380632536468 |
| 25 | 5403055984114 |
| 26 | 21152009997924 |
| 27 | 82835786189975 |
| 28 | 324518950873991 |
| 29 | 1271797441923614 |
| 30 | 4985982054721119 |