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) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 66 |
| 5 | 609 |
| 6 | 3375 |
| 7 | 14181 |
| 8 | 47485 |
| 9 | 136085 |
| 10 | 342739 |
| 11 | 784059 |
| 12 | 1653033 |
| 13 | 3267471 |
| 14 | 6107271 |
| 15 | 10901405 |
| 16 | 18683285 |
| 17 | 30934341 |
| 18 | 49659915 |
| 19 | 77611995 |
| 20 | 118386689 |
| 21 | 176753639 |
| 22 | 258774303 |
| 23 | 372270981 |
| 24 | 526962861 |
| 25 | 735113445 |
| 26 | 1011678595 |
| 27 | 1375177451 |
| 28 | 1847843545 |
| 29 | 2456771055 |
| 30 | 3234056439 |