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 | 5 |
| 1 | 13 |
| 2 | 40 |
| 3 | 136 |
| 4 | 490 |
| 5 | 1828 |
| 6 | 6970 |
| 7 | 26956 |
| 8 | 105250 |
| 9 | 413668 |
| 10 | 1633450 |
| 11 | 6471676 |
| 12 | 25703410 |
| 13 | 102269908 |
| 14 | 407460730 |
| 15 | 1625010796 |
| 16 | 6485595970 |
| 17 | 25899140548 |
| 18 | 103467028810 |
| 19 | 413479908316 |
| 20 | 1652755798930 |
| 21 | 6607533265588 |
| 22 | 26419666417690 |
| 23 | 105647272028236 |
| 24 | 422494919768290 |