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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 50 |
| 5 | 250 |
| 6 | 1250 |
| 7 | 5050 |
| 8 | 6250 |
| 9 | 11810 |
| 10 | 25250 |
| 11 | 31250 |
| 12 | 59050 |
| 13 | 126250 |
| 14 | 156250 |
| 15 | 295250 |
| 16 | 510050 |
| 17 | 631250 |
| 18 | 750250 |
| 19 | 781250 |
| 20 | 1476250 |
| 21 | 2125250 |
| 22 | 2550250 |
| 23 | 3156250 |
| 24 | 3751250 |
| 25 | 3906250 |
| 26 | 5964050 |
| 27 | 7381250 |
| 28 | 10626250 |
| 29 | 12751250 |
| 30 | 13947610 |
| 31 | 15781250 |