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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 39 |
| 7 | 98 |
| 8 | 263 |
| 9 | 759 |
| 10 | 2299 |
| 11 | 7259 |
| 12 | 23649 |
| 13 | 79057 |
| 14 | 269629 |
| 15 | 935328 |
| 16 | 3290260 |
| 17 | 11714285 |
| 18 | 42139053 |
| 19 | 152963037 |
| 20 | 559697097 |
| 21 | 2062574000 |
| 22 | 7649550572 |
| 23 | 28534096988 |
| 24 | 106994891146 |
| 25 | 403119433266 |
| 26 | 1525466082179 |
| 27 | 5795853930652 |
| 28 | 22102635416716 |
| 29 | 84579153865570 |