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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 23 |
| 7 | 58 |
| 8 | 156 |
| 9 | 426 |
| 10 | 1194 |
| 11 | 3393 |
| 12 | 9802 |
| 13 | 28601 |
| 14 | 84347 |
| 15 | 250732 |
| 16 | 750908 |
| 17 | 2262817 |
| 18 | 6857386 |
| 19 | 20882889 |
| 20 | 63877262 |
| 21 | 196162762 |
| 22 | 604567254 |
| 23 | 1869318719 |
| 24 | 5797113028 |
| 25 | 18026873112 |
| 26 | 56197262814 |
| 27 | 175594836698 |
| 28 | 549839459963 |
| 29 | 1725126992844 |
| 30 | 5422602630117 |
| 31 | 17074281639963 |
| 32 | 53848886560675 |
| 33 | 170085320026578 |