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 | 12 |
| 3 | 56 |
| 4 | 342 |
| 5 | 992 |
| 6 | 16256 |
| 7 | 17822 |
| 8 | 169332 |
| 9 | 628056 |
| 10 | 1189190 |
| 11 | 2720850 |
| 12 | 11085570 |
| 13 | 35599122 |
| 14 | 67100672 |
| 15 | 1147210770 |
| 16 | 1317435912 |
| 17 | 1707135806 |
| 18 | 7800334080 |
| 19 | 11208986256 |
| 20 | 13366943840 |
| 21 | 17109032402 |
| 22 | 17179738112 |
| 23 | 46343540900 |
| 24 | 58413331032 |
| 25 | 83717924940 |
| 26 | 204574837700 |
| 27 | 274877382656 |
| 28 | 445968192672 |
| 29 | 589130699852 |