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 | 3 |
| 3 | 3 |
| 4 | 5 |
| 5 | 39 |
| 6 | 206 |
| 7 | 697 |
| 8 | 1656 |
| 9 | 3208 |
| 10 | 8727 |
| 11 | 41667 |
| 12 | 192142 |
| 13 | 688944 |
| 14 | 1965643 |
| 15 | 5117374 |
| 16 | 15888133 |
| 17 | 63924038 |
| 18 | 263759291 |
| 19 | 955198539 |
| 20 | 3017571957 |
| 21 | 9101208987 |
| 22 | 30075674452 |
| 23 | 113177783141 |
| 24 | 437460265979 |
| 25 | 1583161667787 |
| 26 | 5299622270275 |
| 27 | 17294182815347 |
| 28 | 59169678008804 |