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 | 3 |
| 2 | 10 |
| 3 | 36 |
| 4 | 136 |
| 5 | 529 |
| 6 | 2095 |
| 7 | 8393 |
| 8 | 33885 |
| 9 | 137547 |
| 10 | 560544 |
| 11 | 2291181 |
| 12 | 9386584 |
| 13 | 38525224 |
| 14 | 158350133 |
| 15 | 651645511 |
| 16 | 2684323326 |
| 17 | 11066714500 |
| 18 | 45656997415 |
| 19 | 188475894929 |
| 20 | 778444106703 |
| 21 | 3216562337420 |
| 22 | 13296099775859 |
| 23 | 54979806370840 |
| 24 | 227410731720624 |
| 25 | 940875886301665 |