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 | 39 |
| 4 | 148 |
| 5 | 405 |
| 6 | 1254 |
| 7 | 3143 |
| 8 | 8488 |
| 9 | 20853 |
| 10 | 52050 |
| 11 | 123915 |
| 12 | 297804 |
| 13 | 692237 |
| 14 | 1611974 |
| 15 | 3687795 |
| 16 | 8405584 |
| 17 | 18939921 |
| 18 | 42512562 |
| 19 | 94634003 |
| 20 | 209819940 |
| 21 | 462431697 |
| 22 | 1015269486 |
| 23 | 2218786839 |
| 24 | 4832458392 |
| 25 | 10485762025 |
| 26 | 22684180610 |
| 27 | 48922424415 |
| 28 | 105229923596 |