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) |
|---|---|
| 3 | 2 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 16 |
| 9 | 26 |
| 10 | 48 |
| 11 | 90 |
| 12 | 164 |
| 13 | 302 |
| 14 | 564 |
| 15 | 1058 |
| 16 | 1984 |
| 17 | 3744 |
| 18 | 7084 |
| 19 | 13440 |
| 20 | 25576 |
| 21 | 48770 |
| 22 | 93200 |
| 23 | 178482 |
| 24 | 342394 |
| 25 | 657920 |
| 26 | 1266204 |
| 27 | 2440320 |
| 28 | 4709376 |
| 29 | 9099506 |
| 30 | 17602324 |
| 31 | 34087012 |
| 32 | 66076416 |
| 33 | 128207978 |
| 34 | 248983552 |
| 35 | 483939978 |
| 36 | 941362696 |
| 37 | 1832519264 |
| 38 | 3569842948 |