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 | 4 |
| 1 | 36 |
| 2 | 196 |
| 3 | 1444 |
| 4 | 9604 |
| 5 | 66564 |
| 6 | 454276 |
| 7 | 3118756 |
| 8 | 21362884 |
| 9 | 146458404 |
| 10 | 1003749124 |
| 11 | 6880038916 |
| 12 | 47155859716 |
| 13 | 323212716324 |
| 14 | 2215328606404 |
| 15 | 15184099435684 |
| 16 | 104073336269956 |
| 17 | 713329336067076 |
| 18 | 4889231802533764 |
| 19 | 33511293841053604 |
| 20 | 229689823620354244 |
| 21 | 1574317475335503396 |
| 22 | 10790532493690424836 |