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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 24 |
| 4 | 220 |
| 5 | 351 |
| 6 | 560 |
| 7 | 5124 |
| 8 | 8175 |
| 9 | 74801 |
| 10 | 119340 |
| 11 | 190399 |
| 12 | 1742145 |
| 13 | 2779476 |
| 14 | 25432120 |
| 15 | 40575249 |
| 16 | 64735100 |
| 17 | 592324176 |
| 18 | 945013665 |
| 19 | 8646845999 |
| 20 | 13795465320 |
| 21 | 22009743601 |
| 22 | 201388477695 |
| 23 | 321301866624 |
| 24 | 2939902207540 |
| 25 | 4690417633551 |