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 | 7 |
| 2 | 19 |
| 3 | 60 |
| 4 | 212 |
| 5 | 753 |
| 6 | 2546 |
| 7 | 8024 |
| 8 | 23428 |
| 9 | 63430 |
| 10 | 159945 |
| 11 | 377840 |
| 12 | 841419 |
| 13 | 1777036 |
| 14 | 3578998 |
| 15 | 6908102 |
| 16 | 12834739 |
| 17 | 23041529 |
| 18 | 40103959 |
| 19 | 67871516 |
| 20 | 111976374 |
| 21 | 180501843 |
| 22 | 284848554 |
| 23 | 440842772 |
| 24 | 670138334 |
| 25 | 1001971536 |
| 26 | 1475336877 |
| 27 | 2141660944 |