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 | 2 |
| 2 | 11 |
| 3 | 76 |
| 4 | 565 |
| 5 | 4406 |
| 6 | 35455 |
| 7 | 291264 |
| 8 | 2427113 |
| 9 | 20436202 |
| 10 | 173435251 |
| 11 | 1481052596 |
| 12 | 12711044125 |
| 13 | 109543953182 |
| 14 | 947334302951 |
| 15 | 8216780507176 |
| 16 | 71450654876625 |
| 17 | 622692860482514 |
| 18 | 5437356743763163 |
| 19 | 47561030194674972 |
| 20 | 416661242790844421 |