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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 6 |
| 7 | 7 |
| 8 | 21 |
| 9 | 44 |
| 10 | 107 |
| 11 | 274 |
| 12 | 655 |
| 13 | 1484 |
| 14 | 3919 |
| 15 | 10003 |
| 16 | 24765 |
| 17 | 62528 |
| 18 | 161536 |
| 19 | 413954 |
| 20 | 1065515 |
| 21 | 2759833 |
| 22 | 7192471 |
| 23 | 18790104 |
| 24 | 49343301 |
| 25 | 130153728 |
| 26 | 344564793 |
| 27 | 915441196 |
| 28 | 2441445940 |
| 29 | 6530187540 |
| 30 | 17514820829 |
| 31 | 47100909261 |
[0,0,3,6,7,21,44,107,274,655,1484,3919,10003, 24765,62528,161536,413954,1065515,2759833,7192471, 18790104,49343301,130153728,344564793,915441196, 2441445940,6530187540,17514820829,47100909261] |