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 | 6 |
| 2 | 13 |
| 3 | 24 |
| 4 | 43 |
| 5 | 78 |
| 6 | 145 |
| 7 | 276 |
| 8 | 535 |
| 9 | 1050 |
| 10 | 2077 |
| 11 | 4128 |
| 12 | 8227 |
| 13 | 16422 |
| 14 | 32809 |
| 15 | 65580 |
| 16 | 131119 |
| 17 | 262194 |
| 18 | 524341 |
| 19 | 1048632 |
| 20 | 2097211 |
| 21 | 4194366 |
| 22 | 8388673 |
| 23 | 16777284 |
| 24 | 33554503 |
| 25 | 67108938 |
| 26 | 134217805 |
| 27 | 268435536 |
| 28 | 536870995 |
| 29 | 1073741910 |
| 30 | 2147483737 |
| 31 | 4294967388 |
| 32 | 8589934687 |
| 33 | 17179869282 |