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 | 25 |
| 2 | 150 |
| 3 | 675 |
| 4 | 2450 |
| 5 | 7876 |
| 6 | 22825 |
| 7 | 61550 |
| 8 | 155925 |
| 9 | 375875 |
| 10 | 867627 |
| 11 | 1930775 |
| 12 | 4159100 |
| 13 | 8708150 |
| 14 | 17771725 |
| 15 | 35447503 |
| 16 | 69243250 |
| 17 | 132718300 |
| 18 | 249979625 |
| 19 | 463348600 |
| 20 | 846149380 |