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 | 10 |
| 6 | 27 |
| 7 | 78 |
| 8 | 234 |
| 9 | 722 |
| 10 | 2275 |
| 11 | 7288 |
| 12 | 23662 |
| 13 | 77676 |
| 14 | 257372 |
| 15 | 859592 |
| 16 | 2890838 |
| 17 | 9781066 |
| 18 | 33271759 |
| 19 | 113720380 |
| 20 | 390354292 |
| 21 | 1345099574 |
| 22 | 4651222825 |
| 23 | 16134691254 |
| 24 | 56132722306 |
| 25 | 195807489940 |
| 26 | 684712787166 |
| 27 | 2399784312560 |
| 28 | 8428460653683 |
| 29 | 29660054158020 |
| 30 | 104564729164209 |
| 31 | 369263035193928 |