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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 28 |
| 5 | 78 |
| 6 | 207 |
| 7 | 504 |
| 8 | 1169 |
| 9 | 2574 |
| 10 | 5439 |
| 11 | 11071 |
| 12 | 21841 |
| 13 | 41846 |
| 14 | 78193 |
| 15 | 142787 |
| 16 | 255441 |
| 17 | 448444 |
| 18 | 773966 |
| 19 | 1314861 |
| 20 | 2201731 |
| 21 | 3637642 |
| 22 | 5935817 |
| 23 | 9574284 |
| 24 | 15277075 |
| 25 | 24130784 |
| 26 | 37755124 |
| 27 | 58545388 |
| 28 | 90021407 |
| 29 | 137320211 |
| 30 | 207895383 |
| 31 | 312495662 |