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 | 2 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 24 |
| 5 | 49 |
| 6 | 108 |
| 7 | 274 |
| 8 | 826 |
| 9 | 2911 |
| 10 | 11554 |
| 11 | 50096 |
| 12 | 233068 |
| 13 | 1152293 |
| 14 | 6019256 |
| 15 | 33087782 |
| 16 | 190780910 |
| 17 | 1150654755 |
| 18 | 7241711918 |
| 19 | 47454746964 |
| 20 | 323154697536 |
| 21 | 2282779992057 |
| 22 | 16700904490500 |
| 23 | 126356632392346 |
| 24 | 987303454931298 |
| 25 | 7957133905611463 |
| 26 | 66071772829250362 |
| 27 | 564631291138147288 |