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 | 80 |
| 3 | 810 |
| 4 | 5376 |
| 5 | 16250 |
| 6 | 64800 |
| 7 | 120050 |
| 8 | 348160 |
| 9 | 597051 |
| 10 | 1300000 |
| 11 | 1786202 |
| 12 | 4354560 |
| 13 | 4855370 |
| 14 | 9604000 |
| 15 | 13162500 |
| 16 | 22347776 |
| 17 | 24221090 |
| 18 | 47764080 |
| 19 | 47176202 |
| 20 | 87360000 |
| 21 | 97240500 |
| 22 | 142896160 |
| 23 | 148315730 |
| 24 | 282009600 |
| 25 | 254296875 |
| 26 | 388429600 |
| 27 | 435781620 |
| 28 | 645388800 |
| 29 | 595530602 |
| 30 | 1053000000 |