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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 9 |
| 6 | 16 |
| 7 | 32 |
| 8 | 61 |
| 9 | 125 |
| 10 | 246 |
| 11 | 502 |
| 12 | 999 |
| 13 | 2023 |
| 14 | 4040 |
| 15 | 8136 |
| 16 | 16265 |
| 17 | 32649 |
| 18 | 65290 |
| 19 | 130826 |
| 20 | 261643 |
| 21 | 523787 |
| 22 | 1047564 |
| 23 | 2096140 |
| 24 | 4192269 |
| 25 | 8386573 |
| 26 | 16773134 |
| 27 | 33550350 |
| 28 | 67100687 |
| 29 | 134209551 |
| 30 | 268419088 |
| 31 | 536854544 |
| 32 | 1073709073 |
| 33 | 2147450897 |
| 34 | 4294901778 |
| 35 | 8589869074 |
| 36 | 17179738131 |
| 37 | 34359607315 |
| 38 | 68719214612 |
| 39 | 137438691348 |