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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 22 |
| 6 | 63 |
| 7 | 193 |
| 8 | 627 |
| 9 | 2143 |
| 10 | 7677 |
| 11 | 28706 |
| 12 | 111669 |
| 13 | 450529 |
| 14 | 1880164 |
| 15 | 8097765 |
| 16 | 35922614 |
| 17 | 163849371 |
| 18 | 767224522 |
| 19 | 3682984346 |
| 20 | 18102428784 |
| 21 | 91000840873 |
| 22 | 467393250911 |
| 23 | 2450438244585 |
| 24 | 13102651355735 |
| 25 | 71398380128514 |
| 26 | 396202573696587 |