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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 24 |
| 6 | 73 |
| 7 | 164 |
| 8 | 534 |
| 9 | 3187 |
| 10 | 11000 |
| 11 | 39888 |
| 12 | 174411 |
| 13 | 665360 |
| 14 | 2528518 |
| 15 | 10223830 |
| 16 | 39909056 |
| 17 | 154727890 |
| 18 | 612630675 |
| 19 | 2404810575 |
| 20 | 9405235895 |
| 21 | 37053238445 |
| 22 | 145729990271 |
| 23 | 572330060383 |
| 24 | 2253751873412 |
| 25 | 8875044032506 |