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 | 3 |
| 2 | 11 |
| 3 | 30 |
| 4 | 81 |
| 5 | 198 |
| 6 | 477 |
| 7 | 1089 |
| 8 | 2451 |
| 9 | 5358 |
| 10 | 11567 |
| 11 | 24537 |
| 12 | 51577 |
| 13 | 107205 |
| 14 | 221378 |
| 15 | 453900 |
| 16 | 926395 |
| 17 | 1882152 |
| 18 | 3812232 |
| 19 | 7699191 |
| 20 | 15518112 |
| 21 | 31220991 |
| 22 | 62733296 |
| 23 | 125911851 |
| 24 | 252516626 |
| 25 | 506082933 |
| 26 | 1013780968 |
| 27 | 2029989807 |
| 28 | 4063678159 |
| 29 | 8132877129 |
| 30 | 16274093175 |