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 | 126 |
| 4 | 1344 |
| 5 | 2930 |
| 6 | 28060 |
| 7 | 55230 |
| 8 | 538744 |
| 9 | 969378 |
| 10 | 10066228 |
| 11 | 16284862 |
| 12 | 186362560 |
| 13 | 265582226 |
| 14 | 3447630284 |
| 15 | 4238980734 |
| 16 | 64031790664 |
| 17 | 66561185858 |
| 18 | 1197008258212 |
| 19 | 1031815027710 |
| 20 | 22548844488592 |
| 21 | 15830131853490 |
| 22 | 428115681210300 |
| 23 | 240803790623806 |
| 24 | 8188893146929816 |