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 | 24 |
| 2 | 1680 |
| 3 | 11880 |
| 4 | 43680 |
| 5 | 116280 |
| 6 | 255024 |
| 7 | 491400 |
| 8 | 863040 |
| 9 | 1413720 |
| 10 | 2193360 |
| 11 | 3258024 |
| 12 | 4669920 |
| 13 | 6497400 |
| 14 | 8814960 |
| 15 | 11703240 |
| 16 | 15249024 |
| 17 | 19545240 |
| 18 | 24690960 |
| 19 | 30791400 |
| 20 | 37957920 |
| 21 | 46308024 |
| 22 | 55965360 |
| 23 | 67059720 |
| 24 | 79727040 |
| 25 | 94109400 |
| 26 | 110355024 |
| 27 | 128618280 |
| 28 | 149059680 |
| 29 | 171845880 |