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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 9 |
| 6 | 18 |
| 7 | 27 |
| 8 | 58 |
| 9 | 99 |
| 10 | 316 |
| 11 | 936 |
| 12 | 20225 |
| 13 | 410571 |
| 14 | 50745729 |
| 15 | 2993355213 |
| 16 | 1701561156737 |
| 17 | 444491521018441 |
| 18 | 650424404724148930 |
| 19 | 430363737398835017296 |
| 20 | 2886485242642120438501318 |
| 21 | 8838475960755164592843156768 |
| 22 | 152938120727373876718042362054465 |