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 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | -3 |
| 5 | -29 |
| 6 | -72 |
| 7 | -71 |
| 8 | 147 |
| 9 | 796 |
| 10 | 1653 |
| 11 | 979 |
| 12 | -5328 |
| 13 | -20879 |
| 14 | -35997 |
| 15 | -3596 |
| 16 | 169197 |
| 17 | 525571 |
| 18 | 730728 |
| 19 | -435671 |
| 20 | -4960653 |
| 21 | -12703604 |
| 22 | -13307547 |
| 23 | 23595379 |
| 24 | 137323872 |
| 25 | 293994721 |
| 26 | 195364803 |
| 27 | -883879196 |
| 28 | -3628461603 |
| 29 | -6465988829 |
| 30 | -1255658472 |
| 31 | 28562968729 |