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 | 9 |
| 2 | 11 |
| 3 | 14 |
| 4 | 20 |
| 5 | 30 |
| 6 | 50 |
| 7 | 86 |
| 8 | 158 |
| 9 | 294 |
| 10 | 566 |
| 11 | 1094 |
| 12 | 2150 |
| 13 | 4230 |
| 14 | 8390 |
| 15 | 16646 |
| 16 | 33158 |
| 17 | 66054 |
| 18 | 131846 |
| 19 | 263174 |
| 20 | 525830 |
| 21 | 1050630 |
| 22 | 2100230 |
| 23 | 4198406 |
| 24 | 8394758 |
| 25 | 16785414 |
| 26 | 33566726 |
| 27 | 67125254 |
| 28 | 134242310 |
| 29 | 268468230 |
| 30 | 536920070 |
| 31 | 1073807366 |
| 32 | 2147581958 |
| 33 | 4295098374 |