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 | 4 |
| 3 | 11 |
| 4 | 48 |
| 5 | 174 |
| 6 | 784 |
| 7 | 3219 |
| 8 | 14816 |
| 9 | 65082 |
| 10 | 304656 |
| 11 | 1393854 |
| 12 | 6617184 |
| 13 | 31086556 |
| 14 | 149336672 |
| 15 | 714494467 |
| 16 | 3466785216 |
| 17 | 16808037474 |
| 18 | 82244904016 |
| 19 | 402770823114 |
| 20 | 1984987570016 |
| 21 | 9797722907684 |
| 22 | 48581811550112 |
| 23 | 241324198117678 |
| 24 | 1202874359046464 |
| 25 | 6006605345531268 |