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 | 12 |
| 3 | 35 |
| 4 | 80 |
| 5 | 157 |
| 6 | 280 |
| 7 | 471 |
| 8 | 768 |
| 9 | 1241 |
| 10 | 2024 |
| 11 | 3379 |
| 12 | 5824 |
| 13 | 10389 |
| 14 | 19128 |
| 15 | 36143 |
| 16 | 69632 |
| 17 | 135985 |
| 18 | 267976 |
| 19 | 531147 |
| 20 | 1056576 |
| 21 | 2106413 |
| 22 | 4204952 |
| 23 | 8400775 |
| 24 | 16791040 |
| 25 | 33570057 |
| 26 | 67126440 |
| 27 | 134237411 |
| 28 | 268457408 |
| 29 | 536895301 |
| 30 | 1073768824 |
| 31 | 2147513439 |