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 | 1 |
| 6 | 2 |
| 7 | 1 |
| 8 | 4 |
| 9 | 8 |
| 10 | 13 |
| 11 | 29 |
| 12 | 60 |
| 13 | 121 |
| 14 | 275 |
| 15 | 604 |
| 16 | 1332 |
| 17 | 3035 |
| 18 | 6866 |
| 19 | 15623 |
| 20 | 36110 |
| 21 | 83421 |
| 22 | 193114 |
| 23 | 451851 |
| 24 | 1057860 |
| 25 | 2482062 |
| 26 | 5864466 |
| 27 | 13873957 |
| 28 | 32891337 |
| 29 | 78352991 |
| 30 | 186929542 |
| 31 | 446870480 |
| 32 | 1071922233 |
| 33 | 2575310764 |
| 34 | 6198621655 |
| 35 | 14957681872 |
| 36 | 36148936396 |
| 37 | 87506326488 |
| 38 | 212249136940 |
| 39 | 515546059746 |
| 40 | 1254062268245 |