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 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 118 |
| 5 | 995 |
| 6 | 6518 |
| 7 | 32893 |
| 8 | 139369 |
| 9 | 499659 |
| 10 | 1599064 |
| 11 | 4551225 |
| 12 | 12014040 |
| 13 | 29034510 |
| 14 | 66658219 |
| 15 | 142828285 |
| 16 | 295240250 |
| 17 | 576393604 |
| 18 | 1098913338 |
| 19 | 1993354080 |
| 20 | 3560486370 |
| 21 | 6091808112 |
| 22 | 10312711744 |
| 23 | 16796812703 |
| 24 | 27247744649 |
| 25 | 42564714900 |