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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 36 |
| 6 | 113 |
| 7 | 351 |
| 8 | 1080 |
| 9 | 3281 |
| 10 | 9882 |
| 11 | 29646 |
| 12 | 88817 |
| 13 | 266085 |
| 14 | 797526 |
| 15 | 2391485 |
| 16 | 7173360 |
| 17 | 21520080 |
| 18 | 64563521 |
| 19 | 193700403 |
| 20 | 581120892 |
| 21 | 1743392201 |
| 22 | 5230206126 |
| 23 | 15690618378 |
| 24 | 47071766561 |
| 25 | 141215033961 |
| 26 | 423644570442 |
| 27 | 1270932914165 |
| 28 | 3812797945332 |
| 29 | 11438393835996 |