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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 23 |
| 5 | 96 |
| 6 | 409 |
| 7 | 1751 |
| 8 | 7505 |
| 9 | 32176 |
| 10 | 137956 |
| 11 | 591501 |
| 12 | 2536132 |
| 13 | 10873981 |
| 14 | 46623553 |
| 15 | 199904321 |
| 16 | 857114814 |
| 17 | 3674987126 |
| 18 | 15756967635 |
| 19 | 67559972476 |
| 20 | 289671844661 |
| 21 | 1242004318751 |
| 22 | 5325249092137 |
| 23 | 22832672531956 |
| 24 | 97897943538708 |