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 | 1 |
| 2 | 10 |
| 3 | 48 |
| 4 | 170 |
| 5 | 512 |
| 6 | 1398 |
| 7 | 3580 |
| 8 | 8770 |
| 9 | 20808 |
| 10 | 48206 |
| 11 | 109652 |
| 12 | 245850 |
| 13 | 544864 |
| 14 | 1196134 |
| 15 | 2605164 |
| 16 | 5636210 |
| 17 | 12124280 |
| 18 | 25952382 |
| 19 | 55312516 |
| 20 | 117440650 |
| 21 | 248512656 |
| 22 | 524288150 |
| 23 | 1103102108 |
| 24 | 2315255970 |
| 25 | 4848615592 |
| 26 | 10133438638 |
| 27 | 21139292340 |
| 28 | 44023414970 |
| 29 | 91536490688 |