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 | 11 |
| 4 | 24 |
| 5 | 51 |
| 6 | 130 |
| 7 | 315 |
| 8 | 834 |
| 9 | 2195 |
| 10 | 5934 |
| 11 | 16107 |
| 12 | 44368 |
| 13 | 122643 |
| 14 | 341802 |
| 15 | 956635 |
| 16 | 2690844 |
| 17 | 7596483 |
| 18 | 21524542 |
| 19 | 61171659 |
| 20 | 174342216 |
| 21 | 498112275 |
| 22 | 1426419858 |
| 23 | 4093181691 |
| 24 | 11767920118 |
| 25 | 33891544419 |
| 26 | 97764131646 |
| 27 | 282429537947 |
| 28 | 817028472960 |
| 29 | 2366564736723 |