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) |
|---|---|
| 1 | 4 |
| 2 | 79 |
| 3 | 900 |
| 4 | 7885 |
| 5 | 59080 |
| 6 | 398846 |
| 7 | 2499096 |
| 8 | 14805705 |
| 9 | 83969600 |
| 10 | 459868530 |
| 11 | 2447439384 |
| 12 | 12718070274 |
| 13 | 64766697520 |
| 14 | 324156347260 |
| 15 | 1598200903280 |
| 16 | 7776728909121 |
| 17 | 37404399901296 |
| 18 | 178060831286890 |
| 19 | 839857764202520 |
| 20 | 3928581810398630 |
| 21 | 18239060530882224 |
| 22 | 84101317494787684 |