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) |
|---|---|
| 3 | 1 |
| 4 | 53 |
| 5 | 634 |
| 6 | 4201 |
| 7 | 20120 |
| 8 | 78753 |
| 9 | 269829 |
| 10 | 844702 |
| 11 | 2486178 |
| 12 | 7017354 |
| 13 | 19260116 |
| 14 | 51903794 |
| 15 | 138254821 |
| 16 | 365619439 |
| 17 | 962704734 |
| 18 | 2528441803 |
| 19 | 6631057180 |
| 20 | 17376467099 |
| 21 | 45514392201 |
| 22 | 119188310928 |
| 23 | 312079208726 |
| 24 | 817086876180 |
| 25 | 2139230058328 |
| 26 | 5600665608772 |
| 27 | 14662845807193 |