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 | 8 |
| 2 | 26 |
| 3 | 138 |
| 4 | 1104 |
| 5 | 13754 |
| 6 | 261324 |
| 7 | 7686580 |
| 8 | 346018484 |
| 9 | 24069199390 |
| 10 | 2566345975600 |
| 11 | 422456182660436 |
| 12 | 106689940668487188 |
| 13 | 41576384767924321080 |
| 14 | 24871115264481653525780 |
| 15 | 22948996533081051784100632 |