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 | 3 |
| 2 | 9 |
| 3 | 24 |
| 4 | 63 |
| 5 | 153 |
| 6 | 362 |
| 7 | 819 |
| 8 | 1810 |
| 9 | 3872 |
| 10 | 8160 |
| 11 | 16681 |
| 12 | 33756 |
| 13 | 66864 |
| 14 | 130937 |
| 15 | 251982 |
| 16 | 480793 |
| 17 | 903981 |
| 18 | 1685563 |
| 19 | 3106008 |
| 20 | 5677863 |
| 21 | 10276935 |
| 22 | 18464658 |
| 23 | 32891187 |
| 24 | 58169964 |
| 25 | 102136772 |
| 26 | 178096364 |
| 27 | 308593319 |
| 28 | 531191384 |
| 29 | 909227946 |
| 30 | 1546356485 |
| 31 | 2617639292 |