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 | 48 |
| 4 | 126 |
| 5 | 390 |
| 6 | 1014 |
| 7 | 2982 |
| 8 | 8094 |
| 9 | 23646 |
| 10 | 66726 |
| 11 | 196086 |
| 12 | 568302 |
| 13 | 1682382 |
| 14 | 4954998 |
| 15 | 14750310 |
| 16 | 43833150 |
| 17 | 130942398 |
| 18 | 390959430 |
| 19 | 1170256854 |
| 20 | 3502513038 |
| 21 | 10495480494 |
| 22 | 31450265622 |
| 23 | 94296270918 |
| 24 | 282731526366 |