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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 35 |
| 3 | 154 |
| 4 | 588 |
| 5 | 2065 |
| 6 | 6790 |
| 7 | 21071 |
| 8 | 62447 |
| 9 | 177863 |
| 10 | 489279 |
| 11 | 1305402 |
| 12 | 3389603 |
| 13 | 8587999 |
| 14 | 21280436 |
| 15 | 51674728 |
| 16 | 123161500 |
| 17 | 288539664 |
| 18 | 665292642 |
| 19 | 1511359766 |
| 20 | 3386065697 |
| 21 | 7488093282 |
| 22 | 16357998447 |
| 23 | 35324428405 |
| 24 | 75453678433 |
| 25 | 159512035137 |
| 26 | 333918915120 |
| 27 | 692516812176 |
| 28 | 1423479123640 |