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 | 24 |
| 2 | 1944 |
| 3 | 132000 |
| 4 | 8059800 |
| 5 | 471369024 |
| 6 | 27141228576 |
| 7 | 1557898303104 |
| 8 | 89658680843160 |
| 9 | 5186780199744000 |
| 10 | 301901643282754944 |
| 11 | 17682835350047107968 |
| 12 | 1041936263500353390624 |
| 13 | 61736371470508652400000 |
| 14 | 3676501723843796568912000 |
| 15 | 219941299213693627194432000 |