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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 36 |
| 7 | 86 |
| 8 | 270 |
| 9 | 746 |
| 10 | 2554 |
| 11 | 8032 |
| 12 | 29716 |
| 13 | 103482 |
| 14 | 409242 |
| 15 | 1550850 |
| 16 | 6508702 |
| 17 | 26509428 |
| 18 | 117368404 |
| 19 | 508962350 |
| 20 | 2365560998 |
| 21 | 10842378698 |
| 22 | 52685516658 |
| 23 | 253754085960 |
| 24 | 1284660919140 |
| 25 | 6471281910962 |
| 26 | 34031293950258 |