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 | 12 |
| 2 | 132 |
| 3 | 847 |
| 4 | 3921 |
| 5 | 14506 |
| 6 | 45402 |
| 7 | 124707 |
| 8 | 308407 |
| 9 | 699766 |
| 10 | 1477686 |
| 11 | 2936517 |
| 12 | 5540107 |
| 13 | 9993192 |
| 14 | 17333536 |
| 15 | 29048541 |
| 16 | 47220357 |
| 17 | 74703832 |
| 18 | 115341952 |
| 19 | 174223731 |
| 20 | 257989821 |
| 21 | 375191422 |
| 22 | 536708382 |
| 23 | 756232687 |
| 24 | 1050823851 |
| 25 | 1441543026 |
| 26 | 1954172962 |