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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 4 |
| 7 | 7 |
| 8 | 19 |
| 9 | 35 |
| 10 | 69 |
| 11 | 116 |
| 12 | 204 |
| 13 | 323 |
| 14 | 523 |
| 15 | 799 |
| 16 | 1225 |
| 17 | 1809 |
| 18 | 2675 |
| 19 | 3843 |
| 20 | 5515 |
| 21 | 7756 |
| 22 | 10869 |
| 23 | 14998 |
| 24 | 20621 |
| 25 | 27996 |
| 26 | 37865 |
| 27 | 50701 |
| 28 | 67612 |
| 29 | 89419 |
| 30 | 117806 |
| 31 | 154101 |
| 32 | 200838 |
| 33 | 260168 |
| 34 | 335824 |
| 35 | 431202 |
| 36 | 551824 |
| 37 | 702890 |
| 38 | 892503 |
| 39 | 1128577 |
| 40 | 1422846 |
| 41 | 1787183 |
| 42 | 2238554 |
[0,0,0,0,0,4,7,19,35,69,116,204,323,523,799,1225, 1809,2675,3843,5515,7756,10869,14998,20621,27996, 37865,50701,67612,89419,117806,154101,200838, 260168,335824,431202,551824,702890,892503,1128577, 1422846,1787183,2238554] |