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 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 37 |
| 5 | 96 |
| 6 | 251 |
| 7 | 658 |
| 8 | 1723 |
| 9 | 4510 |
| 10 | 11807 |
| 11 | 30912 |
| 12 | 80929 |
| 13 | 211874 |
| 14 | 554693 |
| 15 | 1452206 |
| 16 | 3801925 |
| 17 | 9953568 |
| 18 | 26058779 |
| 19 | 68222770 |
| 20 | 178609531 |
| 21 | 467605822 |
| 22 | 1224207935 |
| 23 | 3205017984 |
| 24 | 8390846017 |
| 25 | 21967520066 |
| 26 | 57511714181 |
| 27 | 150567622478 |