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 | 4 |
| 2 | 10 |
| 3 | 38 |
| 4 | 108 |
| 5 | 358 |
| 6 | 1132 |
| 7 | 3580 |
| 8 | 11382 |
| 9 | 36270 |
| 10 | 114992 |
| 11 | 365628 |
| 12 | 1162290 |
| 13 | 3692624 |
| 14 | 11733828 |
| 15 | 37293892 |
| 16 | 118504546 |
| 17 | 376583590 |
| 18 | 1196750110 |
| 19 | 3803034578 |
| 20 | 12085297922 |
| 21 | 38405269512 |
| 22 | 122045123484 |
| 23 | 387837623386 |
| 24 | 1232482503260 |
| 25 | 3916616317912 |