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 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 14 |
| 6 | 31 |
| 7 | 78 |
| 8 | 235 |
| 9 | 665 |
| 10 | 1926 |
| 11 | 5886 |
| 12 | 21832 |
| 13 | 75333 |
| 14 | 266377 |
| 15 | 933842 |
| 16 | 3422282 |
| 17 | 14954936 |
| 18 | 61055379 |
| 19 | 254751651 |
| 20 | 1054728818 |
| 21 | 4378056288 |
| 22 | 18699691530 |
| 23 | 94021272519 |
| 24 | 443332334411 |
| 25 | 2132051480643 |
| 26 | 10181045388314 |
| 27 | 48729093879838 |