The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 14 |
| 2 | 0 |
| 3 | 16 |
| 4 | 162 |
| 5 | 688 |
| 6 | 3964 |
| 7 | 16600 |
| 8 | 110134 |
| 9 | 492060 |
| 10 | 3362836 |
| 11 | 15603288 |
| 12 | 109979570 |
| 13 | 524685654 |
| 14 | 3720395188 |
| 15 | 18147197844 |
| 16 | 127927252744 |
| 17 | 635400890972 |
| 18 | 4432069428266 |
| 19 | 22357505967916 |
| 20 | 154094669426556 |
| 21 | 788035670396332 |
[14,0,16,162,688,3964,16600,110134,492060,3362836, 15603288,109979570,524685654,3720395188, 18147197844,127927252744,635400890972, 4432069428266,22357505967916,154094669426556, 788035670396332] |