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 | 5 |
| 5 | 12 |
| 6 | 35 |
| 7 | 104 |
| 8 | 343 |
| 9 | 1050 |
| 10 | 3070 |
| 11 | 6620 |
| 12 | 23449 |
| 13 | 38669 |
| 14 | 109104 |
| 15 | 279583 |
| 16 | 546893 |
| 17 | 827035 |
| 18 | 3057332 |
| 19 | 3381124 |
| 20 | 12126683 |
| 21 | 21921192 |
| 22 | 37008138 |
| 23 | 53327764 |
| 24 | 220908809 |
| 25 | 271293803 |