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 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 27 |
| 6 | 59 |
| 7 | 126 |
| 8 | 265 |
| 9 | 551 |
| 10 | 1136 |
| 11 | 2327 |
| 12 | 4743 |
| 13 | 9630 |
| 14 | 19493 |
| 15 | 39363 |
| 16 | 79336 |
| 17 | 159659 |
| 18 | 320915 |
| 19 | 644414 |
| 20 | 1293009 |
| 21 | 2592783 |
| 22 | 5196512 |
| 23 | 10410735 |
| 24 | 20850127 |
| 25 | 41746622 |
| 26 | 83568269 |
| 27 | 167257931 |
| 28 | 334712280 |
| 29 | 669742371 |
| 30 | 1339998971 |