The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 56 |
| 3 | 169 |
| 4 | 550 |
| 5 | 1764 |
| 6 | 5680 |
| 7 | 18225 |
| 8 | 58596 |
| 9 | 188356 |
| 10 | 605458 |
| 11 | 1946025 |
| 12 | 6255180 |
| 13 | 20106256 |
| 14 | 64627982 |
| 15 | 207734569 |
| 16 | 667725402 |
| 17 | 2146283584 |
| 18 | 6898841796 |
| 19 | 22175081569 |
| 20 | 71277802674 |
| 21 | 229109651716 |
| 22 | 736431677100 |
| 23 | 2367126871209 |
| 24 | 7608702637640 |
[16,56,169,550,1764,5680,18225,58596,188356, 605458,1946025,6255180,20106256,64627982, 207734569,667725402,2146283584,6898841796, 22175081569,71277802674,229109651716,736431677100, 2367126871209,7608702637640] |