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) |
|---|---|
| 4 | 2 |
| 5 | 55 |
| 6 | 389 |
| 7 | 1563 |
| 8 | 4642 |
| 9 | 11407 |
| 10 | 24600 |
| 11 | 48204 |
| 12 | 87758 |
| 13 | 150707 |
| 14 | 246787 |
| 15 | 388445 |
| 16 | 591294 |
| 17 | 874603 |
| 18 | 1261822 |
| 19 | 1781142 |
| 20 | 2466090 |
| 21 | 3356159 |
| 22 | 4497473 |
| 23 | 5943487 |
| 24 | 7755722 |
| 25 | 10004535 |
| 26 | 12769924 |
| 27 | 16142368 |
| 28 | 20223702 |
| 29 | 25128027 |
| 30 | 30982655 |
| 31 | 37929089 |
| 32 | 46124038 |
| 33 | 55740467 |
| 34 | 66968682 |
| 35 | 80017450 |
| 36 | 95115154 |
| 37 | 112510983 |
| 38 | 132476157 |
| 39 | 155305187 |
| 40 | 181317170 |