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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 36 |
| 7 | 80 |
| 8 | 180 |
| 9 | 410 |
| 10 | 946 |
| 11 | 2203 |
| 12 | 5173 |
| 13 | 12233 |
| 14 | 29108 |
| 15 | 69643 |
| 16 | 167437 |
| 17 | 404311 |
| 18 | 980125 |
| 19 | 2384441 |
| 20 | 5819576 |
| 21 | 14245384 |
| 22 | 34964611 |
| 23 | 86032272 |
| 24 | 212172668 |
| 25 | 524371704 |
| 26 | 1298509438 |
| 27 | 3221425567 |
| 28 | 8005623916 |
| 29 | 19926840746 |
| 30 | 49674610998 |
| 31 | 124006308008 |