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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 28 |
| 6 | 76 |
| 7 | 235 |
| 8 | 768 |
| 9 | 1679 |
| 10 | 5564 |
| 11 | 19613 |
| 12 | 126070 |
| 13 | 437604 |
| 14 | 1610354 |
| 15 | 6015427 |
| 16 | 27167487 |
| 17 | 104861750 |
| 18 | 403189070 |
| 19 | 1550582656 |
| 20 | 6369655714 |
| 21 | 25112303442 |
| 22 | 98241919002 |
| 23 | 383342448413 |
| 24 | 1531690132421 |
| 25 | 6058160780203 |
| 26 | 23859853900666 |