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 | 1 |
| 5 | 2 |
| 6 | 7 |
| 7 | 27 |
| 8 | 132 |
| 9 | 773 |
| 10 | 5017 |
| 11 | 34861 |
| 12 | 253676 |
| 13 | 1903584 |
| 14 | 14616442 |
| 15 | 114254053 |
| 16 | 906266345 |
| 17 | 7277665889 |
| 18 | 59066524810 |
| 19 | 483864411124 |
| 20 | 3996427278475 |
| 21 | 33250623548406 |
| 22 | 278472800696431 |
| 23 | 2346089674759665 |
| 24 | 19872284655990058 |
| 25 | 169155659546689252 |
| 26 | 1446375853153588731 |
| 27 | 12418636483734071261 |
| 28 | 107034910337046043232 |