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 | 765 |
| 3 | 27435 |
| 4 | 345415 |
| 5 | 2469420 |
| 6 | 12352956 |
| 7 | 48294610 |
| 8 | 157609530 |
| 9 | 447989355 |
| 10 | 1141711615 |
| 11 | 2663460261 |
| 12 | 5775482505 |
| 13 | 11777133550 |
| 14 | 22789550070 |
| 15 | 42150245460 |
| 16 | 74946834916 |
| 17 | 128723876325 |
| 18 | 214401953745 |
| 19 | 347453633935 |
| 20 | 549386792955 |
| 21 | 849592039296 |
| 22 | 1287617552320 |
| 23 | 1915941609990 |
| 24 | 2803320397950 |
| 25 | 4038796372975 |