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 | 15 |
| 2 | 240 |
| 3 | 3855 |
| 4 | 61680 |
| 5 | 986895 |
| 6 | 15790320 |
| 7 | 252645135 |
| 8 | 4042322160 |
| 9 | 64677154575 |
| 10 | 1034834473200 |
| 11 | 16557351571215 |
| 12 | 264917625139440 |
| 13 | 4238682002231055 |
| 14 | 67818912035696880 |
| 15 | 1085102592571150095 |
| 16 | 17361641481138401520 |