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 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 1 |
| 15 | 1 |
| 16 | 1 |
| 17 | 1 |
| 18 | 1 |
| 19 | 0 |
| 20 | 0 |
| 21 | 12 |
| 22 | 13 |
| 23 | -131 |
| 24 | -144 |
| 25 | 1878 |
| 26 | 2047 |
| 27 | -31243 |
| 28 | -34023 |
| 29 | 603493 |
| 30 | 656720 |
| 31 | -13392786 |
| 32 | -14565501 |
| 33 | 338472513 |
| 34 | 367934625 |
| 35 | -9665776360 |
| 36 | -10502979551 |
| 37 | 309738982467 |
| 38 | 336455915833 |
| 39 | -11068897604205 |
| 40 | -12020303454921 |
| 41 | 438669580592210 |