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 | 36 |
| 2 | 450 |
| 3 | 3300 |
| 4 | 17325 |
| 5 | 72072 |
| 6 | 252252 |
| 7 | 772200 |
| 8 | 2123550 |
| 9 | 5348200 |
| 10 | 12514788 |
| 11 | 27511848 |
| 12 | 57316350 |
| 13 | 113954400 |
| 14 | 217443600 |
| 15 | 400096224 |
| 16 | 712671399 |
| 17 | 1232995500 |
| 18 | 2077825750 |
| 19 | 3418915500 |
| 20 | 5504453955 |
| 21 | 8687301480 |
| 22 | 13461727500 |
| 23 | 20510685000 |
| 24 | 30766027500 |
| 25 | 45484495056 |