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 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 26 |
| 6 | 54 |
| 7 | 112 |
| 8 | 227 |
| 9 | 460 |
| 10 | 930 |
| 11 | 1877 |
| 12 | 3780 |
| 13 | 7606 |
| 14 | 15291 |
| 15 | 30720 |
| 16 | 61680 |
| 17 | 123790 |
| 18 | 248346 |
| 19 | 498073 |
| 20 | 998643 |
| 21 | 2001826 |
| 22 | 4011942 |
| 23 | 8039082 |
| 24 | 16106127 |
| 25 | 32263876 |
| 26 | 64623350 |
| 27 | 129424237 |
| 28 | 259179060 |
| 29 | 518975214 |
| 30 | 1039104990 |
| 31 | 2080374784 |
| 32 | 4164816771 |
| 33 | 8337289456 |
| 34 | 16689015778 |