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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 13 |
| 6 | 36 |
| 7 | 105 |
| 8 | 317 |
| 9 | 979 |
| 10 | 3070 |
| 11 | 9731 |
| 12 | 31090 |
| 13 | 99940 |
| 14 | 322832 |
| 15 | 1047007 |
| 16 | 3407017 |
| 17 | 11118165 |
| 18 | 36370984 |
| 19 | 119234791 |
| 20 | 391620238 |
| 21 | 1288394790 |
| 22 | 4244993865 |
| 23 | 14005026856 |
| 24 | 46260856498 |
| 25 | 152974164616 |
| 26 | 506355410344 |
| 27 | 1677603452621 |
| 28 | 5562725698010 |
| 29 | 18459595624048 |
| 30 | 61301038293810 |
| 31 | 203705244194997 |