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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 11 |
| 8 | 21 |
| 9 | 39 |
| 10 | 72 |
| 11 | 135 |
| 12 | 252 |
| 13 | 470 |
| 14 | 876 |
| 15 | 1635 |
| 16 | 3051 |
| 17 | 5691 |
| 18 | 10617 |
| 19 | 19808 |
| 20 | 36956 |
| 21 | 68946 |
| 22 | 128628 |
| 23 | 239976 |
| 24 | 447714 |
| 25 | 835278 |
| 26 | 1558337 |
| 27 | 2907320 |
| 28 | 5424056 |
| 29 | 10119411 |
| 30 | 18879319 |
| 31 | 35222285 |
| 32 | 65712612 |
| 33 | 122597016 |
| 34 | 228723648 |
| 35 | 426719269 |
| 36 | 796110663 |
| 37 | 1485267309 |
| 38 | 2770995395 |