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 | 3 |
| 2 | 7 |
| 3 | 16 |
| 4 | 34 |
| 5 | 70 |
| 6 | 140 |
| 7 | 274 |
| 8 | 527 |
| 9 | 999 |
| 10 | 1871 |
| 11 | 3468 |
| 12 | 6371 |
| 13 | 11613 |
| 14 | 21023 |
| 15 | 37826 |
| 16 | 67688 |
| 17 | 120530 |
| 18 | 213670 |
| 19 | 377252 |
| 20 | 663607 |
| 21 | 1163361 |
| 22 | 2033101 |
| 23 | 3542808 |
| 24 | 6157045 |
| 25 | 10673703 |
| 26 | 18460759 |
| 27 | 31859716 |
| 28 | 54872158 |
| 29 | 94326622 |