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 | 2 |
| 2 | 5 |
| 3 | 18 |
| 4 | 39 |
| 5 | 108 |
| 6 | 288 |
| 7 | 795 |
| 8 | 2278 |
| 9 | 6438 |
| 10 | 18394 |
| 11 | 52556 |
| 12 | 150565 |
| 13 | 431730 |
| 14 | 1238954 |
| 15 | 3556322 |
| 16 | 10210036 |
| 17 | 29317763 |
| 18 | 84190569 |
| 19 | 241782416 |
| 20 | 694380738 |
| 21 | 1994246166 |
| 22 | 5727497628 |
| 23 | 16449560195 |
| 24 | 47243891395 |
| 25 | 135686993036 |
| 26 | 389700996218 |