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 | 5 |
| 2 | 13 |
| 3 | 29 |
| 4 | 73 |
| 5 | 185 |
| 6 | 481 |
| 7 | 1265 |
| 8 | 3361 |
| 9 | 8993 |
| 10 | 24193 |
| 11 | 65345 |
| 12 | 177025 |
| 13 | 480641 |
| 14 | 1307137 |
| 15 | 3559169 |
| 16 | 9699841 |
| 17 | 26452481 |
| 18 | 72173569 |
| 19 | 196989953 |
| 20 | 537802753 |
| 21 | 1468536833 |
| 22 | 4010582017 |
| 23 | 10954043393 |
| 24 | 29920862209 |
| 25 | 81733033985 |
| 26 | 223274237953 |