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 | 5 |
| 3 | 19 |
| 4 | 150 |
| 5 | 561 |
| 6 | 4797 |
| 7 | 18089 |
| 8 | 156900 |
| 9 | 596674 |
| 10 | 5205950 |
| 11 | 19932353 |
| 12 | 174609162 |
| 13 | 672106267 |
| 14 | 5906040623 |
| 15 | 22829936683 |
| 16 | 201114700568 |
| 17 | 780077588440 |
| 18 | 6885880226784 |
| 19 | 26784015828458 |
| 20 | 236826459554380 |
| 21 | 923352937530146 |
| 22 | 8175978023317170 |
| 23 | 31940549289135429 |
| 24 | 283166067626865540 |