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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 30 |
| 5 | 74 |
| 6 | 184 |
| 7 | 456 |
| 8 | 1132 |
| 9 | 2808 |
| 10 | 6968 |
| 11 | 17288 |
| 12 | 42896 |
| 13 | 106432 |
| 14 | 264080 |
| 15 | 655232 |
| 16 | 1625760 |
| 17 | 4033824 |
| 18 | 10008704 |
| 19 | 24833536 |
| 20 | 61616832 |
| 21 | 152883328 |
| 22 | 379333248 |
| 23 | 941199488 |
| 24 | 2335298816 |
| 25 | 5794330112 |
| 26 | 14376858880 |
| 27 | 35671780352 |
| 28 | 88508618240 |