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 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 18 |
| 5 | 48 |
| 6 | 110 |
| 7 | 260 |
| 8 | 586 |
| 9 | 1320 |
| 10 | 2918 |
| 11 | 6412 |
| 12 | 13954 |
| 13 | 30192 |
| 14 | 64926 |
| 15 | 138964 |
| 16 | 296122 |
| 17 | 628664 |
| 18 | 1330134 |
| 19 | 2805916 |
| 20 | 5903090 |
| 21 | 12388736 |
| 22 | 25942542 |
| 23 | 54215268 |
| 24 | 113090858 |
| 25 | 235502408 |
| 26 | 489646150 |
| 27 | 1016575020 |
| 28 | 2107715426 |
| 29 | 4364561680 |
| 30 | 9027384958 |
| 31 | 18651293172 |
| 32 | 38495632794 |