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 | -90 |
| 2 | -216 |
| 3 | -738 |
| 4 | -1170 |
| 5 | -1728 |
| 6 | -2160 |
| 7 | -4500 |
| 8 | -3672 |
| 9 | -6570 |
| 10 | -6480 |
| 11 | -8640 |
| 12 | -9594 |
| 13 | -15300 |
| 14 | -10800 |
| 15 | -17280 |
| 16 | -18450 |
| 17 | -20736 |
| 18 | -19656 |
| 19 | -32580 |
| 20 | -22464 |
| 21 | -36900 |
| 22 | -32400 |
| 23 | -38016 |
| 24 | -36720 |
| 25 | -54090 |
| 26 | -36720 |
| 27 | -59058 |
| 28 | -58500 |
| 29 | -60480 |
| 30 | -53136 |
| 31 | -86580 |
| 32 | -58968 |
| 33 | -86400 |
| 34 | -77760 |