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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 12 |
| 7 | 20 |
| 8 | 40 |
| 9 | 80 |
| 10 | 160 |
| 11 | 308 |
| 12 | 628 |
| 13 | 1256 |
| 14 | 2488 |
| 15 | 5000 |
| 16 | 9940 |
| 17 | 19928 |
| 18 | 39864 |
| 19 | 79660 |
| 20 | 159380 |
| 21 | 318724 |
| 22 | 637496 |
| 23 | 1274980 |
| 24 | 2549924 |
| 25 | 5099884 |
| 26 | 10199748 |
| 27 | 20399528 |
| 28 | 40799020 |
| 29 | 81598052 |
| 30 | 163196124 |
| 31 | 326392240 |
| 32 | 652784444 |
| 33 | 1305568896 |
| 34 | 2611137796 |