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 | 12 |
| 5 | 24 |
| 6 | 46 |
| 7 | 90 |
| 8 | 174 |
| 9 | 337 |
| 10 | 651 |
| 11 | 1261 |
| 12 | 2445 |
| 13 | 4753 |
| 14 | 9258 |
| 15 | 18101 |
| 16 | 35487 |
| 17 | 69823 |
| 18 | 137704 |
| 19 | 272366 |
| 20 | 539797 |
| 21 | 1071969 |
| 22 | 2132017 |
| 23 | 4245964 |
| 24 | 8464289 |
| 25 | 16887427 |
| 26 | 33713589 |
| 27 | 67336900 |
| 28 | 134542546 |
| 29 | 268894341 |
| 30 | 537515903 |
| 31 | 1074640717 |
| 32 | 2148733325 |
| 33 | 4296686409 |
| 34 | 8592299548 |
| 35 | 17183084263 |
| 36 | 34364120060 |
| 37 | 68725368752 |
| 38 | 137446915007 |
| 39 | 274888501928 |
| 40 | 549770021804 |
| 41 | 1099530342380 |
| 42 | 2199048203425 |
| 43 | 4398079052052 |
| 44 | 8796136153039 |
| 45 | 17592241805077 |
| 46 | 35184445671235 |