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 | -1 |
| 2 | -1 |
| 3 | -2 |
| 4 | -3 |
| 5 | -4 |
| 6 | -5 |
| 7 | -6 |
| 8 | -6 |
| 9 | -1 |
| 10 | 19 |
| 11 | 74 |
| 12 | 200 |
| 13 | 461 |
| 14 | 977 |
| 15 | 1987 |
| 16 | 3976 |
| 17 | 7902 |
| 18 | 15559 |
| 19 | 30105 |
| 20 | 56778 |
| 21 | 103833 |
| 22 | 183765 |
| 23 | 314882 |
| 24 | 523007 |
| 25 | 841752 |
| 26 | 1305431 |
| 27 | 1916607 |
| 28 | 2540433 |
| 29 | 2609983 |
| 30 | 381628 |
| 31 | -8814988 |
| 32 | -36463325 |
| 33 | -109113400 |
| 34 | -285322360 |
| 35 | -689608522 |
| 36 | -1579574566 |
| 37 | -3477967848 |