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 | 2 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 9 |
| 6 | 19 |
| 7 | 39 |
| 8 | 77 |
| 9 | 168 |
| 10 | 323 |
| 11 | 682 |
| 12 | 1424 |
| 13 | 2902 |
| 14 | 5956 |
| 15 | 12368 |
| 16 | 25329 |
| 17 | 51866 |
| 18 | 106427 |
| 19 | 217216 |
| 20 | 442313 |
| 21 | 902921 |
| 22 | 1833029 |
| 23 | 3719745 |
| 24 | 7548521 |
| 25 | 15264350 |
| 26 | 30859444 |
| 27 | 62355854 |
| 28 | 125773168 |
| 29 | 253461052 |
| 30 | 510471015 |
| 31 | 1027067090 |
| 32 | 2065390101 |
| 33 | 4151081457 |
| 34 | 8336751732 |
| 35 | 16734781946 |
| 36 | 33583213577 |
| 37 | 67357328359 |
| 38 | 135056786787 |