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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 19 |
| 7 | 43 |
| 8 | 94 |
| 9 | 210 |
| 10 | 464 |
| 11 | 1035 |
| 12 | 2295 |
| 13 | 5111 |
| 14 | 11352 |
| 15 | 25259 |
| 16 | 56145 |
| 17 | 124888 |
| 18 | 277669 |
| 19 | 617554 |
| 20 | 1373201 |
| 21 | 3053883 |
| 22 | 6790995 |
| 23 | 15102178 |
| 24 | 33583784 |
| 25 | 74684504 |
| 26 | 166082706 |
| 27 | 369337117 |
| 28 | 821331578 |
| 29 | 1826484804 |
| 30 | 4061741926 |
| 31 | 9032530513 |