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) |
|---|---|
| 6 | 1 |
| 7 | 3 |
| 8 | 17 |
| 9 | 69 |
| 10 | 322 |
| 11 | 1408 |
| 12 | 6440 |
| 13 | 29555 |
| 14 | 139005 |
| 15 | 662522 |
| 16 | 3228150 |
| 17 | 15994167 |
| 18 | 80849918 |
| 19 | 415684406 |
| 20 | 2177223330 |
| 21 | 11594426886 |
| 22 | 62826444538 |
| 23 | 345909306526 |
| 24 | 1935762918301 |
| 25 | 10999013559517 |
| 26 | 63460591709283 |
| 27 | 371497097807233 |
| 28 | 2206388300667674 |
| 29 | 13286470507994738 |