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 | 3 |
| 2 | 8 |
| 3 | 17 |
| 4 | 34 |
| 5 | 67 |
| 6 | 132 |
| 7 | 261 |
| 8 | 518 |
| 9 | 1031 |
| 10 | 2056 |
| 11 | 4105 |
| 12 | 8202 |
| 13 | 16395 |
| 14 | 32780 |
| 15 | 65549 |
| 16 | 131086 |
| 17 | 262159 |
| 18 | 524304 |
| 19 | 1048593 |
| 20 | 2097170 |
| 21 | 4194323 |
| 22 | 8388628 |
| 23 | 16777237 |
| 24 | 33554454 |
| 25 | 67108887 |
| 26 | 134217752 |
| 27 | 268435481 |
| 28 | 536870938 |
| 29 | 1073741851 |
| 30 | 2147483676 |
| 31 | 4294967325 |
| 32 | 8589934622 |
| 33 | 17179869215 |