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 | 4 |
| 2 | 6 |
| 3 | 15 |
| 4 | 26 |
| 5 | 55 |
| 6 | 111 |
| 7 | 237 |
| 8 | 469 |
| 9 | 926 |
| 10 | 1858 |
| 11 | 3711 |
| 12 | 7419 |
| 13 | 14849 |
| 14 | 29693 |
| 15 | 59435 |
| 16 | 118821 |
| 17 | 237722 |
| 18 | 475378 |
| 19 | 950738 |
| 20 | 1901474 |
| 21 | 3802967 |
| 22 | 7605921 |
| 23 | 15211942 |
| 24 | 30423869 |
| 25 | 60847667 |
| 26 | 121695326 |
| 27 | 243390743 |
| 28 | 486781401 |
| 29 | 973562795 |
| 30 | 1947125641 |
| 31 | 3894251303 |
| 32 | 7788502531 |
| 33 | 15577005118 |