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 | 1740 |
| 2 | 438540 |
| 3 | 38099040 |
| 4 | 1521151500 |
| 5 | 32592806520 |
| 6 | 420775407200 |
| 7 | 3655476494400 |
| 8 | 23690038522380 |
| 9 | 123233778584940 |
| 10 | 538518903906552 |
| 11 | 2045337982427040 |
| 12 | 6914885182908000 |
| 13 | 21207036616238520 |
| 14 | 59847918853661760 |
| 15 | 157231420280219584 |
| 16 | 388094025605841420 |
| 17 | 906869192637613080 |