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 | 1 |
| 2 | 7 |
| 3 | 15 |
| 4 | 112 |
| 5 | 239 |
| 6 | 1785 |
| 7 | 3809 |
| 8 | 28448 |
| 9 | 60705 |
| 10 | 453383 |
| 11 | 967471 |
| 12 | 7225680 |
| 13 | 15418831 |
| 14 | 115157497 |
| 15 | 245733825 |
| 16 | 1835294272 |
| 17 | 3916322369 |
| 18 | 29249550855 |
| 19 | 62415424079 |
| 20 | 466157519408 |
| 21 | 994730462895 |
| 22 | 7429270759673 |
| 23 | 15853271982241 |
| 24 | 118402174635360 |
| 25 | 252657621252961 |
| 26 | 1887005523406087 |