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 | 3 |
| 2 | 9 |
| 3 | 24 |
| 4 | 62 |
| 5 | 160 |
| 6 | 418 |
| 7 | 1112 |
| 8 | 3018 |
| 9 | 8352 |
| 10 | 23522 |
| 11 | 67240 |
| 12 | 194554 |
| 13 | 568304 |
| 14 | 1672146 |
| 15 | 4946808 |
| 16 | 14692970 |
| 17 | 43767616 |
| 18 | 130647490 |
| 19 | 390566216 |
| 20 | 1168815066 |
| 21 | 3500415888 |
| 22 | 10488664754 |
| 23 | 31439779864 |
| 24 | 94264813642 |
| 25 | 282681194720 |
| 26 | 847808703138 |