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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 52 |
| 3 | 168 |
| 4 | 516 |
| 5 | 1560 |
| 6 | 4588 |
| 7 | 13272 |
| 8 | 37788 |
| 9 | 106040 |
| 10 | 294836 |
| 11 | 810304 |
| 12 | 2215196 |
| 13 | 6001792 |
| 14 | 16214140 |
| 15 | 43504736 |
| 16 | 116571316 |
| 17 | 310736008 |
| 18 | 828017772 |
| 19 | 2197752008 |
| 20 | 5835140044 |
| 21 | 15446573864 |
| 22 | 40919565540 |
| 23 | 108157976240 |
| 24 | 286166447228 |
[16,52,168,516,1560,4588,13272,37788,106040, 294836,810304,2215196,6001792,16214140,43504736, 116571316,310736008,828017772,2197752008, 5835140044,15446573864,40919565540,108157976240, 286166447228] |