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 | 0 |
| 1 | 0 |
| 2 | 7710 |
| 3 | 7596480 |
| 4 | 1010580540 |
| 5 | 44878791360 |
| 6 | 995685849690 |
| 7 | 13684147881600 |
| 8 | 132458812569720 |
| 9 | 981010688215680 |
| 10 | 5882352941176470 |
| 11 | 29732178147017280 |
| 12 | 130506535690613940 |
| 13 | 508847995257725760 |
| 14 | 1793608631137129170 |
| 15 | 5795654431511374080 |
| 16 | 17361641481138401520 |