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 | 4 |
| 4 | 8 |
| 5 | 18 |
| 6 | 43 |
| 7 | 103 |
| 8 | 255 |
| 9 | 642 |
| 10 | 1640 |
| 11 | 4242 |
| 12 | 11096 |
| 13 | 29278 |
| 14 | 77882 |
| 15 | 208589 |
| 16 | 562056 |
| 17 | 1522606 |
| 18 | 4144521 |
| 19 | 11329608 |
| 20 | 31090910 |
| 21 | 85618848 |
| 22 | 236530942 |
| 23 | 655344579 |
| 24 | 1820585313 |
| 25 | 5070138554 |
| 26 | 14151907583 |
| 27 | 39584395796 |
| 28 | 110938500821 |
| 29 | 311481097178 |