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 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 14 |
| 4 | 18 |
| 5 | 62 |
| 6 | 566 |
| 7 | 1094 |
| 8 | 3954 |
| 9 | 17150 |
| 10 | 242982 |
| 11 | 573014 |
| 12 | 2717094 |
| 13 | 11553622 |
| 14 | 74420950 |
| 15 | 1427746334 |
| 16 | 4237820914 |
| 17 | 22743623742 |
| 18 | 116389345094 |
| 19 | 709019767190 |
| 20 | 5556385327158 |
| 21 | 152916116876390 |
| 22 | 524244823214950 |
| 23 | 3357960498345390 |
| 24 | 18667422415920486 |
| 25 | 129591208469013462 |