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 | 3 |
| 5 | 6 |
| 6 | 26 |
| 7 | 93 |
| 8 | 424 |
| 9 | 1180 |
| 10 | 4844 |
| 11 | 16165 |
| 12 | 66953 |
| 13 | 216804 |
| 14 | 852822 |
| 15 | 2949804 |
| 16 | 12119134 |
| 17 | 40886724 |
| 18 | 160826008 |
| 19 | 572457489 |
| 20 | 2331396595 |
| 21 | 8104270828 |
| 22 | 32043699894 |
| 23 | 115995102806 |
| 24 | 471268872328 |
| 25 | 1674576998468 |
| 26 | 6641876380417 |
| 27 | 24364816845446 |
| 28 | 98894256728960 |
| 29 | 357006263815751 |