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 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 24 |
| 6 | 54 |
| 7 | 127 |
| 8 | 297 |
| 9 | 689 |
| 10 | 1600 |
| 11 | 3721 |
| 12 | 8652 |
| 13 | 20112 |
| 14 | 46753 |
| 15 | 108689 |
| 16 | 252673 |
| 17 | 587392 |
| 18 | 1365519 |
| 19 | 3174448 |
| 20 | 7379698 |
| 21 | 17155715 |
| 22 | 39882197 |
| 23 | 92714861 |
| 24 | 215535904 |
| 25 | 501060185 |
| 26 | 1164823608 |
| 27 | 2707886360 |
| 28 | 6295072049 |
| 29 | 14634267033 |
| 30 | 34020543361 |