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 | 3 |
| 4 | 6 |
| 5 | 13 |
| 6 | 33 |
| 7 | 85 |
| 8 | 234 |
| 9 | 675 |
| 10 | 2032 |
| 11 | 6367 |
| 12 | 20677 |
| 13 | 69442 |
| 14 | 240529 |
| 15 | 857634 |
| 16 | 3141970 |
| 17 | 11808611 |
| 18 | 45464065 |
| 19 | 179088744 |
| 20 | 720947705 |
| 21 | 2962994169 |
| 22 | 12420658682 |
| 23 | 53061133078 |
| 24 | 230828047288 |
| 25 | 1021809688593 |
| 26 | 4599749893986 |
| 27 | 21043392417004 |
| 28 | 97784119963565 |
| 29 | 461277854065112 |