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 | 9 |
| 4 | 22 |
| 5 | 119 |
| 6 | 300 |
| 7 | 1651 |
| 8 | 4172 |
| 9 | 22989 |
| 10 | 58102 |
| 11 | 320189 |
| 12 | 809250 |
| 13 | 4459651 |
| 14 | 11271392 |
| 15 | 62114919 |
| 16 | 156990232 |
| 17 | 865149209 |
| 18 | 2186591850 |
| 19 | 12049974001 |
| 20 | 30455295662 |
| 21 | 167834486799 |
| 22 | 424187547412 |
| 23 | 2337632841179 |
| 24 | 5908170368100 |
| 25 | 32559025289701 |
| 26 | 82290197605982 |