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 | 4 |
| 2 | 12 |
| 3 | 34 |
| 4 | 93 |
| 5 | 255 |
| 6 | 693 |
| 7 | 1884 |
| 8 | 5122 |
| 9 | 13923 |
| 10 | 37847 |
| 11 | 102880 |
| 12 | 279658 |
| 13 | 760190 |
| 14 | 2066413 |
| 15 | 5617093 |
| 16 | 15268842 |
| 17 | 41505016 |
| 18 | 112822331 |
| 19 | 306682894 |
| 20 | 833650539 |
| 21 | 2266097111 |
| 22 | 6159890600 |
| 23 | 16744318683 |
| 24 | 45515777207 |
| 25 | 123724710091 |
| 26 | 336318631172 |
| 27 | 914208823689 |
| 28 | 2485077232852 |
| 29 | 6755140284380 |