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 | 3 |
| 5 | 6 |
| 6 | 14 |
| 7 | 34 |
| 8 | 98 |
| 9 | 294 |
| 10 | 952 |
| 11 | 3246 |
| 12 | 11698 |
| 13 | 43732 |
| 14 | 170752 |
| 15 | 689996 |
| 16 | 2888034 |
| 17 | 12458784 |
| 18 | 55406422 |
| 19 | 253142182 |
| 20 | 1187934740 |
| 21 | 5712033368 |
| 22 | 28131119956 |
| 23 | 141645386202 |
| 24 | 728841303696 |
| 25 | 3827217750492 |
| 26 | 20499431084644 |
| 27 | 111876916526070 |
| 28 | 621831335167486 |
| 29 | 3516904353610572 |