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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 25 |
| 7 | 46 |
| 8 | 97 |
| 9 | 189 |
| 10 | 344 |
| 11 | 674 |
| 12 | 1383 |
| 13 | 2683 |
| 14 | 4950 |
| 15 | 9955 |
| 16 | 20175 |
| 17 | 39130 |
| 18 | 72905 |
| 19 | 148487 |
| 20 | 298925 |
| 21 | 580328 |
| 22 | 1089343 |
| 23 | 2233409 |
| 24 | 4478413 |
| 25 | 8705686 |
| 26 | 16438345 |
| 27 | 33822205 |
| 28 | 67650909 |
| 29 | 131688362 |
| 30 | 251448212 |
| 31 | 515037942 |
| 32 | 1028483089 |
| 33 | 2004688605 |
| 34 | 3860656125 |
| 35 | 7878708566 |
| 36 | 15715540623 |
| 37 | 30670416703 |
| 38 | 59451560083 |