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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 4 |
| 7 | 8 |
| 8 | 13 |
| 9 | 31 |
| 10 | 71 |
| 11 | 144 |
| 12 | 318 |
| 13 | 729 |
| 14 | 1611 |
| 15 | 3604 |
| 16 | 8249 |
| 17 | 18803 |
| 18 | 42907 |
| 19 | 98858 |
| 20 | 228474 |
| 21 | 528735 |
| 22 | 1228800 |
| 23 | 2865180 |
| 24 | 6693712 |
| 25 | 15676941 |
| 26 | 36807239 |
| 27 | 86584783 |
| 28 | 204060509 |
| 29 | 481823778 |
| 30 | 1139565120 |
| 31 | 2699329341 |
| 32 | 6403500057 |
| 33 | 15211830451 |
| 34 | 36183117255 |
| 35 | 86171536894 |
| 36 | 205459894230 |
| 37 | 490417795075 |