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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 36 |
| 8 | 73 |
| 9 | 147 |
| 10 | 292 |
| 11 | 585 |
| 12 | 1171 |
| 13 | 2340 |
| 14 | 4681 |
| 15 | 9363 |
| 16 | 18724 |
| 17 | 37449 |
| 18 | 74899 |
| 19 | 149796 |
| 20 | 299593 |
| 21 | 599187 |
| 22 | 1198372 |
| 23 | 2396745 |
| 24 | 4793491 |
| 25 | 9586980 |
| 26 | 19173961 |
| 27 | 38347923 |
| 28 | 76695844 |
| 29 | 153391689 |
| 30 | 306783379 |
| 31 | 613566756 |
| 32 | 1227133513 |
| 33 | 2454267027 |
| 34 | 4908534052 |