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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 14 |
| 7 | 30 |
| 8 | 62 |
| 9 | 129 |
| 10 | 278 |
| 11 | 604 |
| 12 | 1313 |
| 13 | 2883 |
| 14 | 6386 |
| 15 | 14203 |
| 16 | 31733 |
| 17 | 71272 |
| 18 | 160725 |
| 19 | 363670 |
| 20 | 825653 |
| 21 | 1880351 |
| 22 | 4293985 |
| 23 | 9830499 |
| 24 | 22558939 |
| 25 | 51880565 |
| 26 | 119552907 |
| 27 | 276012657 |
| 28 | 638348123 |
| 29 | 1478749229 |
| 30 | 3430799333 |
| 31 | 7971134523 |