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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 0 |
| 5 | 6 |
| 6 | 6 |
| 7 | 4 |
| 8 | 24 |
| 9 | 45 |
| 10 | 74 |
| 11 | 210 |
| 12 | 475 |
| 13 | 1111 |
| 14 | 3151 |
| 15 | 7825 |
| 16 | 19538 |
| 17 | 52439 |
| 18 | 134817 |
| 19 | 343283 |
| 20 | 893705 |
| 21 | 2323619 |
| 22 | 6035255 |
| 23 | 15784498 |
| 24 | 41487550 |
| 25 | 109243888 |
| 26 | 288414230 |
| 27 | 764235804 |
| 28 | 2028942492 |
| 29 | 5395231115 |
| 30 | 14383370796 |
[0,0,6,6,4,24,45,74,210,475,1111,3151,7825,19538, 52439,134817,343283,893705,2323619,6035255, 15784498,41487550,109243888,288414230,764235804, 2028942492,5395231115,14383370796] |