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) |
|---|---|
| 4 | 6 |
| 5 | 130 |
| 6 | 1005 |
| 7 | 4830 |
| 8 | 17465 |
| 9 | 52101 |
| 10 | 135135 |
| 11 | 314985 |
| 12 | 674685 |
| 13 | 1349205 |
| 14 | 2548546 |
| 15 | 4587765 |
| 16 | 7925190 |
| 17 | 13210190 |
| 18 | 21341970 |
| 19 | 33540966 |
| 20 | 51434520 |
| 21 | 77158620 |
| 22 | 113477595 |
| 23 | 163923760 |
| 24 | 232959111 |
| 25 | 326161275 |
| 26 | 450436025 |