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 | 1 |
| 3 | 4 |
| 4 | 10 |
| 5 | 32 |
| 6 | 107 |
| 7 | 360 |
| 8 | 1270 |
| 9 | 4544 |
| 10 | 16537 |
| 11 | 61092 |
| 12 | 228084 |
| 13 | 860056 |
| 14 | 3269994 |
| 15 | 12521488 |
| 16 | 48250690 |
| 17 | 186959312 |
| 18 | 727989318 |
| 19 | 2847167632 |
| 20 | 11179394088 |
| 21 | 44053232012 |
| 22 | 174160578150 |
| 23 | 690576010820 |
| 24 | 2745713062854 |
| 25 | 10944253432600 |