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| n | a(n) |
|---|---|
| 10 | 0 |
| 11 | 0 |
| 12 | 2 |
| 13 | 3 |
| 14 | 12 |
| 15 | 23 |
| 16 | 61 |
| 17 | 135 |
| 18 | 306 |
| 19 | 679 |
| 20 | 1499 |
| 21 | 3257 |
| 22 | 7053 |
| 23 | 15164 |
| 24 | 32431 |
| 25 | 69040 |
| 26 | 146411 |
| 27 | 309408 |
| 28 | 651883 |
| 29 | 1369661 |
| 30 | 2870768 |
| 31 | 6003795 |
| 32 | 12530945 |
| 33 | 26106516 |
| 34 | 54298625 |
| 35 | 112761718 |
| 36 | 233840142 |
| 37 | 484291242 |
| 38 | 1001762899 |
| 39 | 2069809195 |
| 40 | 4272039859 |
| 41 | 8808647879 |
| 42 | 18145909421 |
[0,0,2,3,12,23,61,135,306,679,1499,3257,7053, 15164,32431,69040,146411,309408,651883,1369661, 2870768,6003795,12530945,26106516,54298625, 112761718,233840142,484291242,1001762899, 2069809195,4272039859,8808647879,18145909421] |