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 | 19 |
| 4 | 121 |
| 5 | 176 |
| 6 | 725 |
| 7 | 1471 |
| 8 | 5041 |
| 9 | 11989 |
| 10 | 37584 |
| 11 | 97021 |
| 12 | 290521 |
| 13 | 783511 |
| 14 | 2289869 |
| 15 | 6323504 |
| 16 | 18241441 |
| 17 | 51026011 |
| 18 | 146160725 |
| 19 | 411720121 |
| 20 | 1174844176 |
| 21 | 3322046089 |
| 22 | 9459791909 |
| 23 | 26804466571 |
| 24 | 76241702161 |
| 25 | 216275875376 |
| 26 | 614789884829 |
| 27 | 1745053751719 |