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 | 14286 |
| 6 | 43687 |
| 7 | 116757 |
| 8 | 280656 |
| 9 | 619219 |
| 10 | 1273125 |
| 11 | 2467302 |
| 12 | 4547458 |
| 13 | 8027223 |
| 14 | 13648170 |
| 15 | 22454470 |
| 16 | 35884827 |
| 17 | 55883718 |
| 18 | 85034962 |
| 19 | 126719913 |
| 20 | 185303679 |
| 21 | 266351932 |
| 22 | 376882089 |
| 23 | 525651699 |
| 24 | 723488194 |
| 25 | 983663109 |
| 26 | 1322315307 |