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 | 4 |
| 2 | 6 |
| 3 | 14 |
| 4 | 46 |
| 5 | 178 |
| 6 | 226 |
| 7 | 1046 |
| 8 | 1774 |
| 9 | 2258 |
| 10 | 2654 |
| 11 | 19102 |
| 12 | 31366 |
| 13 | 39218 |
| 14 | 62794 |
| 15 | 311842 |
| 16 | 721306 |
| 17 | 740522 |
| 18 | 984226 |
| 19 | 2699066 |
| 20 | 2714402 |
| 21 | 4021466 |
| 22 | 9304706 |
| 23 | 34103414 |
| 24 | 41662646 |
| 25 | 94653386 |
| 26 | 244329494 |
| 27 | 379391318 |
| 28 | 383825566 |
| 29 | 774192266 |