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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 2 |
| 5 | 30 |
| 6 | 24 |
| 7 | 21 |
| 8 | 90 |
| 9 | 126 |
| 10 | 210 |
| 11 | 660 |
| 12 | 462 |
| 13 | 8580 |
| 14 | 6006 |
| 15 | 1980 |
| 16 | 4410 |
| 17 | 157080 |
| 18 | 39270 |
| 19 | 2106720 |
| 20 | 510510 |
| 21 | 5087250 |
| 22 | 1963500 |
| 23 | 91861770 |
| 24 | 29099070 |
| 25 | 1806420 |
| 26 | 17117100 |
| 27 | 48498450 |
| 28 | 135795660 |
| 29 | 340510170 |
| 30 | 562582020 |
| 31 | 5642366730 |
| 32 | 1539968430 |
| 33 | 47683165530 |
| 34 | 17440042620 |