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 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 13 |
| 6 | 31 |
| 7 | 71 |
| 8 | 181 |
| 9 | 447 |
| 10 | 1111 |
| 11 | 2799 |
| 12 | 7083 |
| 13 | 17939 |
| 14 | 45563 |
| 15 | 115997 |
| 16 | 295827 |
| 17 | 755275 |
| 18 | 1929917 |
| 19 | 4935701 |
| 20 | 12631111 |
| 21 | 32340473 |
| 22 | 82837041 |
| 23 | 212248769 |
| 24 | 543978897 |
| 25 | 1394481417 |
| 26 | 3575356033 |
| 27 | 9168277483 |
| 28 | 23512924909 |
| 29 | 60306860253 |
| 30 | 154689354527 |
| 31 | 396809130463 |