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) |
|---|---|
| 0 | 6 |
| 1 | 28 |
| 2 | 210 |
| 3 | 2044 |
| 4 | 22386 |
| 5 | 257908 |
| 6 | 3037530 |
| 7 | 36130444 |
| 8 | 431733666 |
| 9 | 5170140388 |
| 10 | 61978939050 |
| 11 | 743375541244 |
| 12 | 8918294543346 |
| 13 | 107006334784468 |
| 14 | 1283997101947770 |
| 15 | 15407492847694444 |
| 16 | 184887084343023426 |
| 17 | 2218628050709022148 |
| 18 | 26623434909949071690 |
| 19 | 319480609006403630044 |