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 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 13 |
| 4 | 27 |
| 5 | 78 |
| 6 | 278 |
| 7 | 1011 |
| 8 | 3753 |
| 9 | 13843 |
| 10 | 50934 |
| 11 | 187629 |
| 12 | 692891 |
| 13 | 2568882 |
| 14 | 9562074 |
| 15 | 35742329 |
| 16 | 134117829 |
| 17 | 505093740 |
| 18 | 1908474674 |
| 19 | 7232842785 |
| 20 | 27486193251 |
| 21 | 104712247296 |
| 22 | 399816026490 |
| 23 | 1529742725403 |
| 24 | 5864036504705 |
| 25 | 22517947805343 |
| 26 | 86607583200294 |
| 27 | 333599771067256 |