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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 27 |
| 5 | 63 |
| 6 | 142 |
| 7 | 312 |
| 8 | 673 |
| 9 | 1432 |
| 10 | 3015 |
| 11 | 6295 |
| 12 | 13055 |
| 13 | 26926 |
| 14 | 55284 |
| 15 | 113081 |
| 16 | 230572 |
| 17 | 468883 |
| 18 | 951347 |
| 19 | 1926527 |
| 20 | 3894878 |
| 21 | 7863152 |
| 22 | 15855105 |
| 23 | 31936240 |
| 24 | 64269135 |
| 25 | 129234351 |
| 26 | 259690239 |
| 27 | 521524126 |
| 28 | 1046810092 |
| 29 | 2100221753 |
| 30 | 4212028452 |
| 31 | 8444387067 |