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 | 18 |
| 2 | 324 |
| 3 | 1014 |
| 4 | 2749 |
| 5 | 8808 |
| 6 | 26980 |
| 7 | 89417 |
| 8 | 292136 |
| 9 | 996484 |
| 10 | 3383013 |
| 11 | 11790326 |
| 12 | 41028862 |
| 13 | 145231303 |
| 14 | 513949716 |
| 15 | 1839937674 |
| 16 | 6589246547 |
| 17 | 23788589214 |
| 18 | 85938464486 |
| 19 | 312245147469 |
| 20 | 1135416510570 |
| 21 | 4145850489950 |
| 22 | 15151086644931 |