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 | -2 |
| 5 | -3 |
| 6 | -6 |
| 7 | -10 |
| 8 | -19 |
| 9 | -34 |
| 10 | -63 |
| 11 | -115 |
| 12 | -213 |
| 13 | -391 |
| 14 | -723 |
| 15 | -1333 |
| 16 | -2463 |
| 17 | -4547 |
| 18 | -8403 |
| 19 | -15522 |
| 20 | -28686 |
| 21 | -53006 |
| 22 | -97963 |
| 23 | -181042 |
| 24 | -334606 |
| 25 | -618415 |
| 26 | -1142994 |
| 27 | -2112545 |
| 28 | -3904592 |
| 29 | -7216810 |
| 30 | -13338856 |
| 31 | -24654268 |
| 32 | -45568784 |
| 33 | -84225393 |
| 34 | -155675230 |