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 | 0 |
| 1 | 2 |
| 2 | 6 |
| 3 | 15 |
| 4 | 36 |
| 5 | 85 |
| 6 | 198 |
| 7 | 455 |
| 8 | 1032 |
| 9 | 2313 |
| 10 | 5130 |
| 11 | 11275 |
| 12 | 24588 |
| 13 | 53261 |
| 14 | 114702 |
| 15 | 245775 |
| 16 | 524304 |
| 17 | 1114129 |
| 18 | 2359314 |
| 19 | 4980755 |
| 20 | 10485780 |
| 21 | 22020117 |
| 22 | 46137366 |
| 23 | 96469015 |
| 24 | 201326616 |
| 25 | 419430425 |
| 26 | 872415258 |
| 27 | 1811939355 |
| 28 | 3758096412 |
| 29 | 7784628253 |
| 30 | 16106127390 |
| 31 | 33285996575 |
| 32 | 68719476768 |
| 33 | 141733920801 |
| 34 | 292057776162 |