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 | 5 |
| 4 | 14 |
| 5 | 41 |
| 6 | 121 |
| 7 | 355 |
| 8 | 1037 |
| 9 | 3025 |
| 10 | 8824 |
| 11 | 25746 |
| 12 | 75130 |
| 13 | 219246 |
| 14 | 639805 |
| 15 | 1867066 |
| 16 | 5448412 |
| 17 | 15899370 |
| 18 | 46397015 |
| 19 | 135394275 |
| 20 | 395103258 |
| 21 | 1152977744 |
| 22 | 3364582879 |
| 23 | 9818418346 |
| 24 | 28651794889 |
| 25 | 83610752932 |
| 26 | 243990229487 |
| 27 | 712004497223 |
| 28 | 2077748790043 |
| 29 | 6063220178075 |