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 | 2 |
| 3 | 2 |
| 4 | 4 |
| 5 | 6 |
| 6 | 13 |
| 7 | 27 |
| 8 | 70 |
| 9 | 191 |
| 10 | 609 |
| 11 | 2130 |
| 12 | 8526 |
| 13 | 38156 |
| 14 | 194000 |
| 15 | 1109673 |
| 16 | 7176149 |
| 17 | 52238676 |
| 18 | 429004471 |
| 19 | 3970438003 |
| 20 | 41454181730 |
| 21 | 488046132076 |
| 22 | 6482590679282 |
| 23 | 97134793638750 |
| 24 | 1641654359781521 |
| 25 | 31285014253070731 |
| 26 | 672372121341768918 |
| 27 | 16299021330860540657 |