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 | 2 |
| 2 | 6 |
| 3 | 10 |
| 4 | 31 |
| 5 | 68 |
| 6 | 226 |
| 7 | 650 |
| 8 | 2259 |
| 9 | 7542 |
| 10 | 27036 |
| 11 | 96350 |
| 12 | 352786 |
| 13 | 1294652 |
| 14 | 4806366 |
| 15 | 17912120 |
| 16 | 67160083 |
| 17 | 252710672 |
| 18 | 954641186 |
| 19 | 3617076710 |
| 20 | 13744708060 |
| 21 | 52358745532 |
| 22 | 199914446106 |
| 23 | 764881848410 |
| 24 | 2932043941394 |
| 25 | 11259015845684 |
| 26 | 43303894193076 |
| 27 | 166800053312630 |