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 | 0 |
| 2 | -31 |
| 3 | -242 |
| 4 | -1023 |
| 5 | -3124 |
| 6 | -7775 |
| 7 | -16806 |
| 8 | -32767 |
| 9 | -59048 |
| 10 | -99999 |
| 11 | -161050 |
| 12 | -248831 |
| 13 | -371292 |
| 14 | -537823 |
| 15 | -759374 |
| 16 | -1048575 |
| 17 | -1419856 |
| 18 | -1889567 |
| 19 | -2476098 |
| 20 | -3199999 |
| 21 | -4084100 |
| 22 | -5153631 |
| 23 | -6436342 |
| 24 | -7962623 |
| 25 | -9765624 |
| 26 | -11881375 |
| 27 | -14348906 |
| 28 | -17210367 |
| 29 | -20511148 |