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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 26 |
| 7 | 54 |
| 8 | 112 |
| 9 | 226 |
| 10 | 460 |
| 11 | 930 |
| 12 | 1876 |
| 13 | 3780 |
| 14 | 7606 |
| 15 | 15288 |
| 16 | 30720 |
| 17 | 61680 |
| 18 | 123786 |
| 19 | 248346 |
| 20 | 498072 |
| 21 | 998636 |
| 22 | 2001826 |
| 23 | 4011942 |
| 24 | 8039072 |
| 25 | 16106124 |
| 26 | 32263876 |
| 27 | 64623330 |
| 28 | 129424236 |
| 29 | 259179060 |
| 30 | 518975176 |
| 31 | 1039104990 |
| 32 | 2080374784 |
| 33 | 4164816708 |
| 34 | 8337289456 |