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) |
|---|---|
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 71 |
| 13 | 126 |
| 14 | 336 |
| 15 | 330 |
| 16 | 776 |
| 17 | 841 |
| 18 | 1541 |
| 19 | 1821 |
| 20 | 2951 |
| 21 | 3221 |
| 22 | 5322 |
| 23 | 5697 |
| 24 | 43288 |
| 25 | 99626 |
| 26 | 313917 |
| 27 | 807218 |
| 28 | 2049995 |
| 29 | 4769054 |
| 30 | 10240287 |
| 31 | 22002219 |
| 32 | 45015647 |
| 33 | 90239153 |
| 34 | 177239582 |
| 35 | 342276724 |
| 36 | 650127448 |
| 37 | 1223160912 |
| 38 | 2275920969 |
| 39 | 4197371497 |
| 40 | 7754873919 |