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 | 180 |
| 2 | 3380 |
| 3 | 16320 |
| 4 | 52020 |
| 5 | 129064 |
| 6 | 262080 |
| 7 | 489600 |
| 8 | 840500 |
| 9 | 1330420 |
| 10 | 2050344 |
| 11 | 2986560 |
| 12 | 4194240 |
| 13 | 5878440 |
| 14 | 7862400 |
| 15 | 10216320 |
| 16 | 13415220 |
| 17 | 17163880 |
| 18 | 21250420 |
| 19 | 26585280 |
| 20 | 32826664 |
| 21 | 39475200 |
| 22 | 47960640 |
| 23 | 57087360 |
| 24 | 67108800 |
| 25 | 80452188 |
| 26 | 93590440 |
| 27 | 107091840 |
| 28 | 125827200 |
| 29 | 145415080 |