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) |
|---|---|
| 3 | 1 |
| 4 | 0 |
| 5 | 3 |
| 6 | 2 |
| 7 | 9 |
| 8 | 12 |
| 9 | 31 |
| 10 | 53 |
| 11 | 116 |
| 12 | 215 |
| 13 | 446 |
| 14 | 849 |
| 15 | 1726 |
| 16 | 3320 |
| 17 | 6688 |
| 18 | 12932 |
| 19 | 25925 |
| 20 | 50297 |
| 21 | 100546 |
| 22 | 195562 |
| 23 | 390257 |
| 24 | 760630 |
| 25 | 1516233 |
| 26 | 2960502 |
| 27 | 5897425 |
| 28 | 11533047 |
| 29 | 22964739 |
| 30 | 44972711 |
| 31 | 89528901 |
| 32 | 175546608 |
| 33 | 349425044 |
| 34 | 685913758 |
| 35 | 1365249931 |
| 36 | 2682660933 |