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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 13 |
| 5 | 27 |
| 6 | 54 |
| 7 | 108 |
| 8 | 216 |
| 9 | 433 |
| 10 | 867 |
| 11 | 1734 |
| 12 | 3469 |
| 13 | 6939 |
| 14 | 13878 |
| 15 | 27756 |
| 16 | 55512 |
| 17 | 111025 |
| 18 | 222050 |
| 19 | 444101 |
| 20 | 888202 |
| 21 | 1776404 |
| 22 | 3552808 |
| 23 | 7105617 |
| 24 | 14211235 |
| 25 | 28422470 |
| 26 | 56844941 |
| 27 | 113689883 |
| 28 | 227379766 |
| 29 | 454759532 |
| 30 | 909519064 |
| 31 | 1819038129 |
| 32 | 3638076259 |
| 33 | 7276152518 |