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 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 36 |
| 4 | 640 |
| 5 | 21888 |
| 6 | 1451008 |
| 7 | 188941312 |
| 8 | 48768745472 |
| 9 | 25069815595008 |
| 10 | 25722272102744064 |
| 11 | 52730972085034156032 |
| 12 | 216091838647321476726784 |
| 13 | 1770657164881170759078117376 |
| 14 | 29013990909330956353981535748096 |