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) |
|---|---|
| 1 | 3 |
| 2 | 36 |
| 3 | 780 |
| 4 | 5880 |
| 5 | 88572 |
| 6 | 241332 |
| 7 | 1206864 |
| 8 | 2352276 |
| 9 | 7401768 |
| 10 | 29741124 |
| 11 | 44375136 |
| 12 | 128286252 |
| 13 | 237505128 |
| 14 | 316068060 |
| 15 | 538960656 |
| 16 | 1108217916 |
| 17 | 2109026508 |
| 18 | 2576018532 |
| 19 | 4522918884 |
| 20 | 6405013944 |
| 21 | 7566711048 |
| 22 | 12154372464 |
| 23 | 16347018324 |
| 24 | 24849064152 |
| 25 | 41648599776 |