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 | 4 |
| 4 | 17 |
| 5 | 51 |
| 6 | 136 |
| 7 | 393 |
| 8 | 1233 |
| 9 | 3865 |
| 10 | 11851 |
| 11 | 36301 |
| 12 | 112520 |
| 13 | 351352 |
| 14 | 1098189 |
| 15 | 3433704 |
| 16 | 10758609 |
| 17 | 33794505 |
| 18 | 106344793 |
| 19 | 335061790 |
| 20 | 1056924667 |
| 21 | 3338026857 |
| 22 | 10554163533 |
| 23 | 33402840615 |
| 24 | 105809430024 |
| 25 | 335444908176 |
| 26 | 1064268538776 |
| 27 | 3379009937161 |
| 28 | 10735253448349 |
| 29 | 34127137228747 |