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 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 35 |
| 5 | 89 |
| 6 | 203 |
| 7 | 444 |
| 8 | 951 |
| 9 | 2051 |
| 10 | 4466 |
| 11 | 9860 |
| 12 | 21840 |
| 13 | 48045 |
| 14 | 104525 |
| 15 | 225116 |
| 16 | 482596 |
| 17 | 1035632 |
| 18 | 2232443 |
| 19 | 4834801 |
| 20 | 10493117 |
| 21 | 22741208 |
| 22 | 49074134 |
| 23 | 105310087 |
| 24 | 224848230 |
| 25 | 478534776 |
| 26 | 1017589182 |
| 27 | 2166420553 |
| 28 | 4622251942 |
| 29 | 9880423138 |
| 30 | 21130501759 |
| 31 | 45125126178 |