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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 14 |
| 8 | 28 |
| 9 | 56 |
| 10 | 113 |
| 11 | 227 |
| 12 | 455 |
| 13 | 910 |
| 14 | 1820 |
| 15 | 3640 |
| 16 | 7281 |
| 17 | 14563 |
| 18 | 29127 |
| 19 | 58254 |
| 20 | 116508 |
| 21 | 233016 |
| 22 | 466033 |
| 23 | 932067 |
| 24 | 1864135 |
| 25 | 3728270 |
| 26 | 7456540 |
| 27 | 14913080 |
| 28 | 29826161 |
| 29 | 59652323 |
| 30 | 119304647 |
| 31 | 238609294 |
| 32 | 477218588 |
| 33 | 954437176 |
| 34 | 1908874353 |
| 35 | 3817748707 |
| 36 | 7635497415 |
| 37 | 15270994830 |