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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 19 |
| 5 | 54 |
| 6 | 164 |
| 7 | 476 |
| 8 | 1417 |
| 9 | 4087 |
| 10 | 12589 |
| 11 | 37818 |
| 12 | 116828 |
| 13 | 358277 |
| 14 | 1106870 |
| 15 | 3460676 |
| 16 | 10813998 |
| 17 | 34339769 |
| 18 | 109194390 |
| 19 | 350181146 |
| 20 | 1126919513 |
| 21 | 3634208553 |
| 22 | 11774823887 |
| 23 | 38335906599 |
| 24 | 125461951555 |
| 25 | 411934520324 |
| 26 | 1356668825821 |
| 27 | 4478273903272 |
| 28 | 14813386035089 |
| 29 | 49127626291866 |