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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 66 |
| 7 | 361 |
| 8 | 1778 |
| 9 | 8207 |
| 10 | 36310 |
| 11 | 156095 |
| 12 | 657785 |
| 13 | 2733065 |
| 14 | 11241497 |
| 15 | 45900679 |
| 16 | 186420826 |
| 17 | 754165809 |
| 18 | 3042167236 |
| 19 | 12245294090 |
| 20 | 49211278321 |
| 21 | 197535872510 |
| 22 | 792216674789 |
| 23 | 3175088068035 |
| 24 | 12719020008668 |
| 25 | 50932090504830 |
| 26 | 203896407951944 |
| 27 | 816089798651203 |
[1,10,66,361,1778,8207,36310,156095,657785, 2733065,11241497,45900679,186420826,754165809, 3042167236,12245294090,49211278321,197535872510, 792216674789,3175088068035,12719020008668, 50932090504830,203896407951944,816089798651203] |