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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 44 |
| 4 | 152 |
| 5 | 552 |
| 6 | 2000 |
| 7 | 7628 |
| 8 | 28440 |
| 9 | 108792 |
| 10 | 411888 |
| 11 | 1586424 |
| 12 | 6066032 |
| 13 | 23474384 |
| 14 | 90378912 |
| 15 | 351072012 |
| 16 | 1358520600 |
| 17 | 5293045208 |
| 18 | 20561697200 |
| 19 | 80309986856 |
| 20 | 312934745552 |
| 21 | 1224770426672 |
| 22 | 4784290151264 |
| 23 | 18757260263352 |
| 24 | 73421632108656 |
[4,8,44,152,552,2000,7628,28440,108792,411888, 1586424,6066032,23474384,90378912,351072012, 1358520600,5293045208,20561697200,80309986856, 312934745552,1224770426672,4784290151264, 18757260263352,73421632108656] |