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 | 0 |
| 2 | 1 |
| 3 | -5 |
| 4 | 16 |
| 5 | -35 |
| 6 | 66 |
| 7 | -126 |
| 8 | 226 |
| 9 | -335 |
| 10 | 461 |
| 11 | -715 |
| 12 | 1082 |
| 13 | -1365 |
| 14 | 1695 |
| 15 | -2420 |
| 16 | 3286 |
| 17 | -3876 |
| 18 | 4581 |
| 19 | -5985 |
| 20 | 7791 |
| 21 | -8986 |
| 22 | 9912 |
| 23 | -12650 |
| 24 | 16242 |
| 25 | -17585 |
| 26 | 19111 |
| 27 | -24086 |
| 28 | 29115 |
| 29 | -31465 |
| 30 | 34106 |
| 31 | -40920 |
| 32 | 49662 |
| 33 | -53080 |
| 34 | 55030 |
| 35 | -66206 |
| 36 | 79412 |
| 37 | -82251 |
| 38 | 85406 |
| 39 | -102640 |
| 40 | 119931 |