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 | 3 |
| 4 | 5 |
| 5 | 11 |
| 6 | 23 |
| 7 | 48 |
| 8 | 98 |
| 9 | 204 |
| 10 | 421 |
| 11 | 863 |
| 12 | 1766 |
| 13 | 3606 |
| 14 | 7341 |
| 15 | 14913 |
| 16 | 30233 |
| 17 | 61175 |
| 18 | 123589 |
| 19 | 249344 |
| 20 | 502443 |
| 21 | 1011366 |
| 22 | 2033894 |
| 23 | 4086975 |
| 24 | 8206833 |
| 25 | 16469875 |
| 26 | 33035611 |
| 27 | 66234372 |
| 28 | 132745859 |
| 29 | 265961487 |
| 30 | 532717894 |
| 31 | 1066778687 |
| 32 | 2135822457 |
| 33 | 4275459730 |
| 34 | 8557335141 |
| 35 | 17125445575 |
| 36 | 34268965676 |
| 37 | 68568213419 |
| 38 | 137187103849 |
| 39 | 274458924246 |