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) |
|---|---|
| 8 | 1 |
| 9 | 12 |
| 10 | 94 |
| 11 | 604 |
| 12 | 3461 |
| 13 | 18412 |
| 14 | 93016 |
| 15 | 452500 |
| 16 | 2139230 |
| 17 | 9890404 |
| 18 | 44921002 |
| 19 | 201099320 |
| 20 | 889594210 |
| 21 | 3896177956 |
| 22 | 16920602244 |
| 23 | 72954802376 |
| 24 | 312595497011 |
| 25 | 1332153819572 |
| 26 | 5650155211024 |
| 27 | 23864065957572 |
| 28 | 100418115489408 |