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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 3 |
| 6 | 8 |
| 7 | 10 |
| 8 | 14 |
| 9 | 42 |
| 10 | 94 |
| 11 | 200 |
| 12 | 430 |
| 13 | 1026 |
| 14 | 3208 |
| 15 | 8282 |
| 16 | 17982 |
| 17 | 46332 |
| 18 | 164230 |
| 19 | 468100 |
| 20 | 1125394 |
| 21 | 3366910 |
| 22 | 12419216 |
| 23 | 38282268 |
| 24 | 101471130 |
| 25 | 326653640 |
| 26 | 1275804912 |
| 27 | 4237867810 |
| 28 | 12181603724 |
[1,3,8,10,14,42,94,200,430,1026,3208,8282,17982, 46332,164230,468100,1125394,3366910,12419216, 38282268,101471130,326653640,1275804912, 4237867810,12181603724] |