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 | 16 |
| 2 | 44 |
| 3 | 121 |
| 4 | 286 |
| 5 | 676 |
| 6 | 1482 |
| 7 | 3249 |
| 8 | 6840 |
| 9 | 14400 |
| 10 | 29640 |
| 11 | 61009 |
| 12 | 123994 |
| 13 | 252004 |
| 14 | 508526 |
| 15 | 1026169 |
| 16 | 2062468 |
| 17 | 4145296 |
| 18 | 8312988 |
| 19 | 16670889 |
| 20 | 33390774 |
| 21 | 66879684 |
| 22 | 133865682 |
| 23 | 267944161 |
| 24 | 536117488 |
| 25 | 1072693504 |
| 26 | 2145878288 |
| 27 | 4292739361 |
| 28 | 8586527026 |