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 | 11 |
| 6 | 81 |
| 7 | 512 |
| 8 | 3151 |
| 9 | 20071 |
| 10 | 133853 |
| 11 | 924320 |
| 12 | 6551293 |
| 13 | 47529561 |
| 14 | 354259153 |
| 15 | 2725545695 |
| 16 | 21741995463 |
| 17 | 180198265559 |
| 18 | 1551865576121 |
| 19 | 13865702570254 |
| 20 | 128238585735637 |
| 21 | 1224733005946425 |
| 22 | 12053244176971825 |
| 23 | 122035994844818345 |
| 24 | 1269623551116437475 |
| 25 | 13561114665253219451 |