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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 18 |
| 6 | 52 |
| 7 | 116 |
| 8 | 296 |
| 9 | 650 |
| 10 | 1556 |
| 11 | 3372 |
| 12 | 7768 |
| 13 | 16660 |
| 14 | 37416 |
| 15 | 79592 |
| 16 | 175568 |
| 17 | 371034 |
| 18 | 807604 |
| 19 | 1697660 |
| 20 | 3657464 |
| 21 | 7654460 |
| 22 | 16357496 |
| 23 | 34106712 |
| 24 | 72407728 |
| 25 | 150499908 |
| 26 | 317777032 |
| 27 | 658707896 |
| 28 | 1384524656 |
| 29 | 2863150440 |
| 30 | 5994736336 |