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) |
|---|---|
| 5 | 1 |
| 6 | 5 |
| 7 | 29 |
| 8 | 127 |
| 9 | 583 |
| 10 | 2446 |
| 11 | 10484 |
| 12 | 43363 |
| 13 | 181546 |
| 14 | 748840 |
| 15 | 3114308 |
| 16 | 12878441 |
| 17 | 53594473 |
| 18 | 222761422 |
| 19 | 930856456 |
| 20 | 3893811380 |
| 21 | 16365678160 |
| 22 | 68937445765 |
| 23 | 291656714515 |
| 24 | 1237403762663 |
| 25 | 5271285939671 |
| 26 | 22524961082326 |
| 27 | 96620152734652 |
| 28 | 415768621923904 |
| 29 | 1795530067804295 |