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 | 1 |
| 2 | -3 |
| 3 | -30 |
| 4 | -2686 |
| 5 | -517311 |
| 6 | -173118807 |
| 7 | -88535206152 |
| 8 | -63977172334344 |
| 9 | -61971659588102940 |
| 10 | -77470793599569049440 |
| 11 | -121439997599825393413344 |
| 12 | -233353875172602479932391040 |
| 13 | -539638027429765922735002220880 |
| 14 | -1479049138515818646669055218090480 |
| 15 | -4742815067612592169849894663392228480 |
| 16 | -17597031102801426396121130730318359114880 |
| 17 | -74817150772352720408567833273371047298417408 |