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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 16 |
| 7 | 41 |
| 8 | 106 |
| 9 | 304 |
| 10 | 880 |
| 11 | 2674 |
| 12 | 8284 |
| 13 | 26347 |
| 14 | 85076 |
| 15 | 279324 |
| 16 | 928043 |
| 17 | 3118915 |
| 18 | 10580145 |
| 19 | 36199094 |
| 20 | 124774041 |
| 21 | 432990333 |
| 22 | 1511628113 |
| 23 | 5306305978 |
| 24 | 18719781786 |
| 25 | 66342222729 |
| 26 | 236100395649 |
| 27 | 843490024052 |
| 28 | 3024220006717 |
| 29 | 10878908844745 |
| 30 | 39255047915513 |