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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 3 |
| 9 | 18 |
| 10 | 24 |
| 11 | 84 |
| 12 | 224 |
| 13 | 280 |
| 14 | 630 |
| 15 | 1270 |
| 16 | 1527 |
| 17 | 2937 |
| 18 | 5742 |
| 19 | 6930 |
| 20 | 15015 |
| 21 | 35035 |
| 22 | 44044 |
| 23 | 108164 |
| 24 | 260064 |
| 25 | 328944 |
| 26 | 767244 |
| 27 | 1720944 |
| 28 | 2152710 |
| 29 | 4738410 |
| 30 | 10329750 |
| 31 | 12890614 |
| 32 | 28583709 |
| 33 | 64071194 |
| 34 | 80628669 |
| 35 | 184657869 |
[0,0,0,0,0,0,0,3,18,24,84,224,280,630,1270,1527, 2937,5742,6930,15015,35035,44044,108164,260064, 328944,767244,1720944,2152710,4738410,10329750, 12890614,28583709,64071194,80628669,184657869] |