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 | 1 |
| 5 | 3 |
| 6 | 9 |
| 7 | 23 |
| 8 | 62 |
| 9 | 169 |
| 10 | 451 |
| 11 | 1217 |
| 12 | 3291 |
| 13 | 8916 |
| 14 | 24243 |
| 15 | 66155 |
| 16 | 181053 |
| 17 | 497134 |
| 18 | 1369064 |
| 19 | 3780942 |
| 20 | 10469573 |
| 21 | 29063361 |
| 22 | 80867990 |
| 23 | 225508124 |
| 24 | 630145449 |
| 25 | 1764240907 |
| 26 | 4948365051 |
| 27 | 13902893423 |
| 28 | 39124094362 |
| 29 | 110265280739 |
| 30 | 311208414556 |
| 31 | 879523722747 |
| 32 | 2488832434859 |