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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 13 |
| 5 | 21 |
| 6 | 52 |
| 7 | 84 |
| 8 | 210 |
| 9 | 392 |
| 10 | 905 |
| 11 | 1601 |
| 12 | 3652 |
| 13 | 7173 |
| 14 | 15364 |
| 15 | 28932 |
| 16 | 61952 |
| 17 | 122900 |
| 18 | 253969 |
| 19 | 493572 |
| 20 | 1017858 |
| 21 | 2031636 |
| 22 | 4128801 |
| 23 | 8159232 |
| 24 | 16547841 |
| 25 | 33030657 |
| 26 | 66584836 |
| 27 | 132251649 |
| 28 | 266600448 |
| 29 | 532677128 |
| 30 | 1069548544 |
| 31 | 2139095042 |