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 | 0 |
| 3 | 0 |
| 4 | 306 |
| 5 | 2365 |
| 6 | 19047 |
| 7 | 90503 |
| 8 | 328324 |
| 9 | 981693 |
| 10 | 2547955 |
| 11 | 5933257 |
| 12 | 12681288 |
| 13 | 25284363 |
| 14 | 47595023 |
| 15 | 85357395 |
| 16 | 146879312 |
| 17 | 243867873 |
| 18 | 392452803 |
| 19 | 614423653 |
| 20 | 938708560 |
| 21 | 1403123967 |
| 22 | 2056426383 |
| 23 | 2960698943 |
| 24 | 4194107208 |
| 25 | 5854060325 |