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) |
|---|---|
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 12 |
| 7 | 28 |
| 8 | 96 |
| 9 | 252 |
| 10 | 600 |
| 11 | 1364 |
| 12 | 3048 |
| 13 | 6552 |
| 14 | 13804 |
| 15 | 29040 |
| 16 | 59520 |
| 17 | 122400 |
| 18 | 248472 |
| 19 | 504868 |
| 20 | 1017840 |
| 21 | 2054388 |
| 22 | 4126100 |
| 23 | 8294444 |
| 24 | 16628160 |
| 25 | 33349800 |
| 26 | 66784536 |
| 27 | 133775712 |
| 28 | 267736392 |
| 29 | 535920696 |
| 30 | 1072242540 |
| 31 | 2145452092 |
| 32 | 4291768320 |
| 33 | 8585609340 |
| 34 | 17173070880 |
| 35 | 34350563940 |