The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 2 |
| 2 | 10 |
| 3 | 14 |
| 4 | 54 |
| 5 | 112 |
| 6 | 340 |
| 7 | 814 |
| 8 | 2254 |
| 9 | 5702 |
| 10 | 15250 |
| 11 | 39404 |
| 12 | 104004 |
| 13 | 270922 |
| 14 | 711490 |
| 15 | 1859134 |
| 16 | 4873054 |
| 17 | 12748472 |
| 18 | 33391060 |
| 19 | 87394454 |
| 20 | 228841254 |
| 21 | 599050102 |
| 22 | 1568437210 |
| 23 | 4106054164 |
| 24 | 10750060804 |
| 25 | 28143585362 |
| 26 | 73681573690 |
| 27 | 192899714414 |
| 28 | 505019869254 |
| 29 | 1322156172352 |
[4,2,10,14,54,112,340,814,2254,5702,15250,39404, 104004,270922,711490,1859134,4873054,12748472, 33391060,87394454,228841254,599050102,1568437210, 4106054164,10750060804,28143585362,73681573690, 192899714414,505019869254,1322156172352] |