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 | 1 |
| 1 | 25 |
| 2 | 325 |
| 3 | 2950 |
| 4 | 21100 |
| 5 | 126905 |
| 6 | 667850 |
| 7 | 3157725 |
| 8 | 13667175 |
| 9 | 54900675 |
| 10 | 206841715 |
| 11 | 736953800 |
| 12 | 2499500175 |
| 13 | 8113694575 |
| 14 | 25320834800 |
| 15 | 76253908740 |
| 16 | 222308896150 |
| 17 | 629146702350 |
| 18 | 1732518057650 |
| 19 | 4651937973250 |
| 20 | 12201443983695 |
| 21 | 31311905220800 |
| 22 | 78732034002275 |
| 23 | 194220161393825 |